Introduction to Hummingbirds. Main navigation. A colorful collage of scientifically accurate illustration of various species of hummingbirds. That’s less than a US penny! They are the smallest bird in the world, and are the only bird to be able to fly forwards as well as backwards. Hummingbirds represent one of nature's most interesting paradoxes. We deck-sit every April, watching and waiting in keen Comment document.getElementById("comment").setAttribute( "id", "a127607391ac20f0cc79a0610e5447e5" );document.getElementById("c153dc27e7").setAttribute( "id", "comment" ); Save my name, email, and website in this browser for the next time I comment. [4], The family Trochilidae was introduced in 1825 by the Irish zoologist Nicholas Aylward Vigors with Trochilus as the type genus. Hummingbirds are the world's smallest warm-blooded animals. [36], The highest recorded wingbeats for wild hummingbirds during hovering is 88 per second, as measured for the purple-throated woodstar (Calliphlox mitchellii) weighing 3.2 g.[37] The number of beats per second increases above "normal" while hovering during courtship displays (up to 90 beats per second for the calliope hummingbird, Stellula calliope), a wingbeat rate 40% higher than its typical hovering rate. [113], The migratory ruby-throated hummingbird breeds in a range from the southeastern United States to Ontario,[114] while the black-chinned hummingbird, its close relative and another migrant, is the most widespread and common species in the southwestern United States. Most male hummingbirds attract a female with their rather feeble song. [88], One study of Anna's hummingbirds found that dietary protein was an influential factor in feather color, as birds receiving more protein grew significantly more colorful crown feathers than those fed a low-protein diet. [59] During a day of nectar consumption with a corresponding high water intake that may total five times the body weight per day, hummingbird kidneys process water via glomerular filtration rates (GFR) in amounts proportional to water consumption, thereby avoiding overhydration. Pale-tailed barbthroat is an amazing types of hummingbirds mostly seen in the Amazon Basin and bordering countries such as  Brazil, Bolivia, Colombia, Ecuador, Peru, French Guiana, Guyana, Suriname, and Venezuela. [50][51] These data suggest that hummingbirds are able to oxidize sugar in flight muscles at rates high enough to satisfy their extreme metabolic demands. [119], As calculated by displacement of body size, the rufous hummingbird makes perhaps the longest migratory journey of any bird in the world. Native American Indians thought they were magic, and they are certainly magical. (1999). The Glitter in the Green is a beautiful adventure about one man's quests to seek out hummingbirds across the world. Hummingbirds are found exclusively in the Americas and this vast continent has approximately 345 species, mostly located in the northern Andes. It can grow upto 7.5 cm (3 in) and a weight under 3 grams. 623–24 in: del Hoyo, J., A. Elliott, & J. Sargatal. Previous Hemiprocnidae. Saw-billed hermit is one of the amazing types of hummingbirds mostly seen in southeastern Brazil and belongs to the genus Ramphodon. [43][44] A study of broad-tailed hummingbirds indicated that hummingbirds have a fourth color-sensitive visual cone (humans have three) that detects ultraviolet light and enables discrimination of non-spectral colors, possibly having a role in courtship displays, territorial defense, and predator evasion. English. 6. At rest, a hummingbird takes an average of 250 breaths per minute. About 12 species are found regularly in the United States and Canada. [104], Male rufous and broad-tailed hummingbirds (genus Selasphorus) have a distinctive wing feature during normal flight that sounds like jingling or a buzzing shrill whistle. [117], The rufous hummingbird breeds farther north than any other species of hummingbird,[117] often breeding in large numbers in temperate North America and wintering in increasing numbers along the coasts of the subtropical Gulf of Mexico and Florida, rather than in western or central Mexico. The hummingbirds form nine major clades: the topazes and jacobins, the hermits, the mangoes, the coquettes, the brilliants, the giant hummingbird (Patagona gigas), the mountaingems, the bees, and the emeralds. Courtesy Timber Press Bee hummingbirds live in Cuba Smallest Hummingbird in the World Bee Hummingbird. [81] Most species build a cup-shaped nest on the branch of a tree or shrub,[82] although a few tropical species normally attach their nests to leaves. Though many die during their first year of life, especially in the vulnerable period between hatching and fledging, those that survive may occasionally live a decade or more. Events Kids Birding: Technology in Nature. [59][60], Hummingbird kidneys also have a unique ability to control the levels of electrolytes after consuming nectars with high amounts of sodium and chloride or none, indicating that kidney and glomerular structures must be highly specialized for variations in nectar mineral quality. [109], Behaviorally, the trill serves several purposes:[109], Hummingbirds are restricted to the Americas from south central Alaska to Tierra del Fuego, including the Caribbean. [47][48] During flight, oxygen consumption per gram of muscle tissue in a hummingbird is about 10 times higher than that measured in elite human athletes. Skip to content; Search. [10] The Latin names are those proposed by Dickinson and Remsen in 2013. Of those species that have been measured in wind tunnels, their top speeds exceed 15 m/s (54 km/h; 34 mph) and some species can dive at speeds in excess of 23 m/s (83 km/h; 51 mph).[1][2]. Hummingbirds of the World Gallery. [147] Commercial products sold as "instant nectar" or "hummingbird food" may also contain preservatives and/or artificial flavors as well as dyes which are unnecessary,[147] although the long-term effects of these additives on hummingbirds have not been systematically studied. They might be the most agile birds in the world, but that doesn’t mean hummingbirds are safe from predators. You may also find additional photos or links to sites with more information about that species. [25] Thus females are better at foraging, acquiring flower nectar, and supporting the energy demands of their larger body size. all come with their own stand for display! Species lists of birds for South American countries and territories: Ecuador. your own Pins on Pinterest It is therefore worth the effort for hummingbirds to chase away competitors, so they have access and control of their favorite flowers. [39] They also vary the orientation and enlarge the collective surface area of their tail feathers into the shape of a fan. [55][56], While hovering, hummingbirds do not benefit from the heat loss by air convection during forward flight, except for air movement generated by their rapid wing-beat, possibly aiding convective heat loss from the extended feet. Call us (08:30-17:00 UK) 01803 865913 International +44 1803 865913 Email [email protected] All contact information Need Help? [130], Hummingbirds drink with their long tongues by rapidly lapping nectar. The pectoral muscles are the bird’s broad … [68][69], The metabolism of hummingbirds can slow at night or at any time when food is not readily available: the birds enter a hibernatory, deep-sleep state (known as torpor) to prevent energy reserves from falling to a critical level. Sooty barbthroat is a species of humminbird native to the northeastern part of the Amazon Basin. They are specialized for feeding on nectar but all species also consume insects or spiders. The bright radiant color on hummingbirds comes from iridescent coloring like on a soap bubble or prism. [74], Hummingbirds have unusually long lifespans for organisms with such rapid metabolisms. Rufous Hummingbirds are very aggressive, they are territorial and also very protective of food sources. [40] In natural settings full of highly complex background motion, hummingbirds are able to precisely hover in place by rapid coordination of vision with body position. Please submit to our lifelist! Hummingbird Facts Hummingbirds are the tiniest birds in the world. RECOMMENDED VIDEOS FOR YOU... A Rufous hummingbird and a bumblebee fly toward Crocosmia flowers. Of the more than 300 hummingbird species in the world, fewer than two dozen venture as far north as the United States and Canada, and only a handful remain there year-round. [22] Males tend to be smaller than females, allowing conservation of energy to forage competitively and participate more frequently in courtship. [148] Although some commercial products contain small amounts of nutritional additives, hummingbirds obtain all necessary nutrients from the insects they eat, rendering added nutrients unnecessary. [16] One key evolutionary factor appears to have been an altered taste receptor that enabled hummingbirds to seek nectar. The 2-inch (5 cm) bee hummingbird (Mellisuga helenae) is the smallest hummingbird and the smallest bird in the world… In 2004 Gerald Mayr identified two 30-million-year-old hummingbird fossils. Hummingbirds comprise one of the most interesting groups of birds found anywhere in the world. [18] By 22 million years ago, the ancestral species of current hummingbirds became established in South America where environmental conditions stimulated further diversification. But they wait to feed at a flower at the risk of other hummingbirds beating them to the punch. by [48] This hummingbird, like other long-distance migrating birds, stores fat as a fuel reserve augmenting its weight by as much as 100%, then enabling metabolic fuel for flying over open water. Cornell Lab of Ornithology, Ithaca, NY, USA. Next Opisthocomidae. Hummingbirds have become accustomed to seeing humans in their habitats and will fly right up to anyone they feel they can trust, some of them even drinking out of a feeder being held by a human. [103] The bird can sing at the same frequency as the tail feather chirp, but its small syrinx is not capable of the same volume. [citation needed] The nest varies in size relative to the particular species – from smaller than half a walnut shell to several centimeters in diameter. have long bills that allow them to probe deep into flowers with long corollae. White-necked jacobin is a bit large and beautiful hummingbird native to the  Mexico, south to Peru, Bolivia and south Brazil. Surprise Me. Hummingbirds are among the smallest of bird families, with most species measuring in the 7.5–13 cm (3–5 in) range. The sicklebills' extremely decurved bills are adapted to extracting nectar from the curved corollae of flowers in the family Gesneriaceae. Hummingbirds are are among the smallest of birds. [119] By migrating in spring as far north as the Yukon or southern Alaska,[117][119] the rufous hummingbird migrates more extensively and nests farther north than any other hummingbird species, and must tolerate occasional temperatures below freezing in its breeding territory. [132][135] Consequently, tongue flexibility enables accessing, transporting and unloading nectar. Close. See more ideas about beautiful birds, hummingbird, pet birds. [105] The sound is caused by the aerodynamics of rapid air flow past tail feathers, causing them to flutter in a vibration which produces the high-pitched sound of a courtship dive. From the diminutive Bee Hummingbird in Cuba (probably the smallest bird in the world) to the Giant Hummingbird of Chile. 36 likes. [61] Morphological studies on Anna's hummingbird kidneys showed adaptations of high capillary density in close proximity to nephrons, allowing for precise regulation of water and electrolytes. [120] Arrival at breeding grounds before nectar availability from mature flowers may jeopardize breeding opportunities. According to the International Ornithologists’ Union offers, there are  360 hummingbird species exist on planet Earth and all these are distributed among 112 genera. [81][83] Hummingbirds stay in the nest for 18–22 days, after which they leave the nest to forage on their own, although the mother bird may continue feeding them for another 25 days. On an average, it can grow 10.7 cm (4.2 in) long and weighs 7 g (0.25 oz). Scroll To Top Black-throated hermit is the species of hummingbirds mostly seen in the  Colombia, Ecuador, and Peru. The bee hummingbird is native to Cuba and weighs in less than 0.07 ounces (2 g). [108] The harmonics of sounds during courtship dives vary across species of hummingbirds. What a Tea Party you would have with these 12 BEAUTIFUL (and all different) Tea Cups & Saucers!! [16], The hummingbird evolutionary tree shows ancestral hummingbirds splitting from insectivorous swifts (family Apodidae) and treeswifts (family Hemiprocnidae) about 42 million years ago, probably in Eurasia. Salaman, P., T. Donegan, & D. Caro (2009). [45], Hummingbirds are highly sensitive to stimuli in their visual fields, responding to even minimal motion in any direction by reorienting themselves in midflight. Out of all […] More. Vintage Franklin Mint Porcelain Hummingbirds of the World Tea Cup & Saucer Sets. Howard and Moore Complete Checklist of the Birds of the World, University of California Botanical Garden, "Flight costs of long, sexually selected tails in hummingbirds", "Observations on the natural affinities that connect the orders and families of birds", "Phylogenetic systematics and biogeography of hummingbirds: Bayesian and maximum likelihood analyses of partitioned data and selection of an appropriate partitioning strategy", "Molecular phylogenetics and the diversification of hummingbirds", "DNA hybridization evidence for the principal lineages of hummingbirds (Aves:Trochilidae)", "DNA-DNA hybridization evidence for subfamily structure among hummingbirds", "Fossil evidence of wing shape in a stem relative of swifts and hummingbirds (Aves, Pan-Apodiformes)", "Hummingbirds' 22-million-year-old history of remarkable change is far from complete", "Evolution of sweet taste perception in hummingbirds by transformation of the ancestral umami receptor", "The temporal build-up of hummingbird/plant mutualisms in North America and temperate South America", "Diversity and clade ages of West Indian hummingbirds and the largest plant clades dependent on them: a 5–9 Myr young mutualistic system", "Escape from extreme specialization: Passionflowers, bats and the sword-billed hummingbird", "Rensch's Rule Crosses the Line: Convergent Allometry of Sexual Size Dimorphism in Hummingbirds and Flower Mites", "Evolution of sexual dimorphism in bill size and shape of hermit hummingbirds (Phaethornithinae): a role for ecological causation", "Geographical Aspects of Bird Flower Coevolution, with Particular Reference to Central America", "Morphological traits determine specialization and resource use in plant–hummingbird networks in the Neotropics", "Absurd Creature of the Week: The World's Tiniest Bird Weighs Less Than a Dime", "Nectar as food for birds: the physiological consequences of drinking dilute sugar solutions", "Specialization on traits as basis for the niche‐breadth of flower visitors and as structuring mechanism of ecological networks", "Wing, tail, and vocal contributions to the complex acoustic signals of courting Calliope hummingbirds", "Hummingbird flight stability and control in freestream turbulent winds", "Hummingbirds control hovering flight by stabilizing visual motion", "Eye morphology and retinal topography in hummingbirds (, "Neural specialization for hovering in hummingbirds: hypertrophy of the pretectal nucleus Lentiformis mesencephali", "Neurons responsive to global visual motion have unique tuning properties in hummingbirds", "Hummingbirds see motion in an unexpected way", "Wild hummingbirds discriminate nonspectral colors", "Adipose energy stores, physical work, and the metabolic syndrome: Lessons from hummingbirds", "Hummingbirds can fuel expensive hovering flight completely with either exogenous glucose or fructose", "Oxidation rate and turnover of ingested sugar in hovering Anna's (, "Sugar metabolism in hummingbirds and nectar bats", "Hovering in the heat: effects of environmental temperature on heat regulation in foraging hummingbirds", "Hovering energetics and thermal balance in Anna's hummingbirds (, "Infrared video shows how hummingbirds shed heat through their eyes and feet", "The role of the feet in behavioral thermoregulation of hummingbirds", "Hummingbirds arrest their kidneys at night: diel variation in glomerular filtration rate in Selasphorus platycercus", "Gastrointestinal and renal responses to water intake in the green-backed firecrown (Sephanoides sephanoides), a South American hummingbird", 10.1002/(sici)1097-4687(199905)240:2<95::aid-jmor1>3.0.co;2-u, "Song sounds of various hummingbird species", "Behaviourally driven gene expression reveals song nuclei in hummingbird brain", 10.1002/1096-9861(20001016)426:2<182::AID-CNE2>3.0.CO;2-M, "Time Scales of Critical Events Around the Cretaceous-Paleogene Boundary", "Ultrasonic singing by the blue-throated hummingbird: A comparison between production and perception", "The hummingbird syrinx morphome: a detailed three-dimensional description of the black jacobin's vocal organ", "The vocal organ of hummingbirds shows convergence with songbirds", "Influence of normal daytime fat deposition on laboratory measurements of torpor use in territorial versus nonterritorial hummingbirds", "These Hummingbirds Take Extreme Naps. Hummingbirds can see colors that we can’t even imagine. You will not see a hummingbird flock or migrate in groups. DNA-DNA hybridization results[14] suggest that the main radiation of South American hummingbirds took place at least partly in the Miocene, some 12 to 13 million years ago, during the uplifting of the northern Andes. Hummingbirds, which are tiny, colorful, thin-beaked birds, get their name from the humming noise that occurs when they flap their wings very fast. [127] Hummingbirds spend an average of 10–15% of their time feeding and 75–80% sitting and digesting. The small neat cup-shaped nest is decorated with moss or lichen and is usually attached with cobwebs to thin branches of a tree or bush but a few species attach their nest beneath a large leaf such as a palm frond. Events Winter Bird Count (Free) Saturday, December 17, 2016 at 10:00am . To remove the water from their heads, they shake their heads and bodies, similar to a dog shaking, to shed water. Marinelle Adams [99] Further, when raindrops collectively may weigh as much as 38% of the bird's body weight, hummingbirds shift their bodies and tails horizontally, beat their wings faster, and reduce their wings' angle of motion when flying in heavy rain. "Dietary protein level affects iridescent coloration in Anna's hummingbirds, "Aerodynamics of the hovering hummingbird", "Backward flight in hummingbirds employs unique kinematic adjustments and entails low metabolic cost", "Three-dimensional kinematics of hummingbird flight", "Effects of flight speed upon muscle activity in hummingbirds", "Hummingbirds edge out helicopters in hover contest", "Hummingbirds shake their heads to deal with rain", "Hummingbird rain trick: New study shows tiny birds alter posture in storms", "Courtship dives of Anna's hummingbird offer insights into flight performance limits", "The Anna's hummingbird chirps with its tail: A new mechanism of sonation in birds", "Harmonic hopping, and both punctuated and gradual evolution of acoustic characters in Selasphorus hummingbird tail-feathers", "Hummingbird feather sounds are produced by aeroelastic flutter, not vortex-induced vibration", "Hummingbird sings with its tail feathers", "Roles of the Wing Whistle in the Territorial Behaviour of Male Broad-tailed Hummingbirds (. 2. [87], By merely shifting position, feather regions of a muted-looking bird can instantly become fiery red or vivid green. While hummingbirds are beautiful, they have a good purpose on Earth, too! A ratio of 1 part sugar to 4 parts water, or 25% concentration, is a common recipe,[140] although hummingbirds will defend feeders more aggressively when sugar content is at 35%, indicating preference for nectar with higher sweetness and sugar content. October 14, 2020, 11:55 pm, by Many exhibit wonderfully irridescent plumage that changes in varying light; some, like the Sword-billed Hummingbird, have remarkable adaptations for feeding.An encounter, no matter how brief, leaves a lasting memory. Stripe-throated hermit is the species of hummingbird native to  Central America and north-western South America. These hummingbirds have a very strict routine, often returning to the same area each and every year. In areas where they occur, they are seen in peoples gardens. Food appears to be more important than breeding as males have been seen chasing females away from manmade bird feeders, even in the middle of the breeding season. Trochilidae Hummingbirds. The bill is curved in the adaptation of certain flowers mostly genera Centropogon and Heliconia. In Birds of the World (P. G. Rodewald, Editor). Hummingbird species adapted for life at higher altitudes therefore have larger wings to help offset these negative effects of low air density on lift generation. Walt Whitman found great joy and solace in watching a hummingbird “coming and going, daintily balancing and shimmering about,” as he was learning anew how to balance a body coming and going in the world after his paralytic stroke. [119], The northward migration of rufous hummingbirds occurs along the Pacific flyway[119] and may be time-coordinated with flower and tree leaf emergence in spring in early March, and also with availability of insects as food. Tapajós hermit is the species of hummingbird mostly seen in the south-eastern Amazon in Brazil. Grey-chinned hermit is one of the most beautiful types of hummingbirds native to Colombia, Ecuador, Peru, Venezuela and even in northern Brazil. [125], To supply energy needs, hummingbirds drink nectar, a sweet liquid inside certain flowers. The hummingbird family has the third-greatest number of species of any bird family (after the tyrant flycatchers and the tanagers).[8][12]. It can grow up to 6.7 centimetres long and weight under 3 grams. All Shops Toggle … Scroll To Top [54] When air temperatures rise above 36 °C (97 °F), thermal gradients driving heat passively by convective dissipation from around the eyes, shoulders, and feet are reduced or eliminated, requiring heat dissipation mainly by evaporation and exhalation. [83] Incubation lasts 14 to 23 days,[84] depending on the species, ambient temperature, and female attentiveness to the nest. [155] The ability to discriminate colors of flowers and plumage is enabled by a visual system having four single cone cells and a double cone screened by photoreceptor oil droplets which enhance color discrimination. They may swarm a hummingbird feederto grab a quick snack on their way through town, but they don't fly together. It can grow upto 5–6 in (13–15 cm) and wieghs approximately 8-12.5 gms. These enchanting birds are found in deserts, mountains, and plains, but most live in tropical rainforests. [103][104] Hummingbirds cannot make the courtship dive sound when missing their outer tail feathers, and those same feathers could produce the dive-sound in a wind tunnel. [24] Conversely, the Lesbiini clade (coquettes) displays very little size dimorphism; males and females are similar in size. [31][32] Hummingbird-pollinated flowers also produce relatively weak nectar (averaging 25% sugars w/w) containing a high proportion of sucrose, whereas insect-pollinated flowers typically produce more concentrated nectars dominated by fructose and glucose. Due to this exceptional evolutionary pattern, as many as 140 hummingbird species can coexist in a specific region, such as the Andes range. A page about all the hummingbirds that are described in the world. Their high-speed antics and bright colors make them a favorite in everyone's garden. Submit your best shots! At the other end of the size spectrum, the tiny bee hummingbird, endemic to Cuba, is the world’s smallest bird. [24], Sexual size and bill differences likely evolved due to constraints imposed by courtship because mating displays of male hummingbirds require complex aerial maneuvers. Explore Taxonomy; Account navigation. [132] While capillary action was believed to be what drew nectar into these tubes, high-speed photography has revealed that the tubes open down their sides as the tongue goes into the nectar, and then close around the nectar, trapping it so it can be pulled back into the beak. A few species are year-round residents of Florida, California, and the far southwestern desert regions of the US. [23] The extent of this sexual size difference varies among clades of hummingbirds. Their high-speed antics and bright colors make them a favorite in everyone's garden. Hummingbird feeding from a flower in the University of California Botanical Garden, Hummingbird with yellow pollen on its beak in the University of California Botanical Garden, Juvenile Anna's hummingbird with tongue sticking out, Hummingbird chicks in a nest in a cactus in Mesa, Arizona, Hummingbird adult in its nest in a cactus in Mesa, Arizona. Broad-tipped hermit is the species of humming bird mostly seen in the northeast Brazil. While in other parts of the world, hummingbirds were considered to be the symbol of adaptability. Black jacobin is a beautiful type of humminbird mostly seen in the Atlantic Forest of eastern Brazil, Uruguay, eastern Paraguay, and far north-eastern Argentina. [43][44][40] Their visual sensitivity allows them to precisely hover in place while in complex and dynamic natural environments,[40] functions enabled by the lentiform nucleus which is tuned to fast-pattern velocities, enabling highly tuned control and collision avoidance during forward flight. [129] When catching insects in flight, a hummingbird's jaw flexes downward to widen the gape for successful capture. Hook-billed hermit is the endangered species of hummingbird native to the humid forests in eastern Brazil. These levels correspond to the four domains of manifestation of vibration and light: the physical world (our body), the realm of thoughts and ideas (mind), the realm of myth (soul), and the world of Spirit (energy). [68] What makes the hummingbird's syrinx different from that of other birds in the Apodiformes order is the presence of internal muscle structure, accessory cartilages, and a large tympanum that serves as an attachment point for external muscles, all of which are adaptations thought to be responsible for the hummingbird's increased ability in pitch control and large frequency range. [3][46] Their heart rate can reach as high as 1,260 beats per minute, a rate once measured in a blue-throated hummingbird, with a breathing rate of 250 breaths per minute, even at rest. [22], Female hummingbirds tend to be larger, requiring more energy, with longer beaks that allow for more effective reach into crevices of tall flowers for nectar. It is very closely related to the black-throated hermit. It loves to eat anthropods of the flowering plant such as Costus, Aechmea, Palicourea and Drymonia. The majority of species occur in tropical and subtropical Central and South America. [25] Directional selection will thus favor the larger hummingbirds in terms of acquiring food. [19][20] The same is true for the sword-billed hummingbird (Ensifera ensifera), one of the morphologically most extreme species, and one of its main food plant clades (Passiflora section Tacsonia). The two halves of a hummingbird's bill have a pronounced overlap, with the lower half (mandible) fitting tightly inside the upper half (maxilla). [124] Hummingbirds hover within insect swarms in a method called "hover-hawking" to facilitate feeding. The bill of the fiery-tailed awlbill has an upturned tip, as in the avocets. It was first described in the year 1950  as a subspecies of the little hermit. Switch to the light mode that's kinder on your eyes at day time. Hummingbirds are the only birds in the world that can fly backward. Black jacobin is a beautiful type of humminbird mostly seen in the Atlantic Forest of … The almost 340 species of hummingbirds are entirely restricted to the New World Bronzy hermit is a species of hummingbird mostly seen in the forests and thickets from eastern Honduras south to western Panama, and in the Chocó of western Colombia and north-western Ecuador.The bird species is very similar to the rufous-breasted hermit. The areas where these early fossils have been found had a climate quite similar to that of the northern Caribbean or southernmost China during that time. Kan Dail [89] Additionally, birds on a high-protein diet grew yellower (higher hue) green tail feathers than birds on a low-protein diet.[89]. Events Christmas Bird Count. [150], Hummingbirds have exceptional visual acuity providing them with discrimination of food sources while foraging.