Illinois, located in the heart of the Midwest United States, is home to a fascinating variety of hummingbirds that attract the attention of birdwatchers, naturalists, and wildlife photographers alike. Although the state is not as famous for hummingbird diversity as some western states, several species are regularly observed here, especially during migration seasons. The dazzling aerial acrobats of the hummingbird family bring vibrant flashes of color and rapid wingbeats to gardens, parks, and natural areas across Illinois. This article explores the hummingbirds found in Illinois, offering detailed insights into their classification, distribution, physical features, behavior, breeding habits, conservation status, and some intriguing facts about these remarkable birds.
Scientific Classification
Hummingbirds belong to the family Trochilidae, a diverse group of small, nectar-feeding birds known for their iridescent plumage and extraordinary flight capabilities. The hummingbirds recorded in Illinois belong primarily to the genus Archilochus and Selasphorus, with occasional vagrant sightings from other genera. The most common and well-known species in Illinois is the Ruby-throated Hummingbird (Archilochus colubris), which is the only hummingbird species that regularly breeds in the eastern United States.
Other species that appear less frequently or as accidental visitors include the Rufous Hummingbird (Selasphorus rufus), known for its fiery orange plumage; the Allen’s Hummingbird (Selasphorus sasin), a rare vagrant from the West Coast; the Broad-billed Hummingbird (Cynanthus latirostris), mostly found in Mexico but occasionally straying into Illinois; and the Black-chinned Hummingbird (Archilochus alexandri), a rare visitor. These species represent a fascinating glimpse of hummingbird diversity in a state where they are not typically abundant but are nonetheless a cherished part of local wildlife.
Geographic Range & Distribution
The Ruby-throated Hummingbird is the predominant species in Illinois, with a breeding range that extends throughout the eastern United States and southern Canada. In Illinois, Ruby-throated Hummingbirds generally arrive in early to mid-April and remain through September, with most individuals migrating south to Central America for the winter. Males typically arrive first to establish feeding territories, followed by females and juveniles approximately two weeks later. Their presence is commonly noted in woodlands, gardens, parks, and suburban areas where nectar sources are abundant.
The Rufous Hummingbird is a western species with a breeding range primarily along the Pacific Coast and the Rocky Mountains. However, during migration, some individuals stray eastward and have been recorded in Illinois as casual vagrants, especially in autumn. These birds are often seen visiting feeders and flower gardens and are known for their aggressive territorial behavior.
Rare sightings of other species such as the Allen’s Hummingbird and Broad-billed Hummingbird occur sporadically, generally in late summer to fall. The Broad-billed Hummingbird is primarily a Mexican species, with occasional vagrants reaching as far north as Illinois, usually between July and December. The Black-chinned Hummingbird, native to the southwestern United States, has been documented only a handful of times in Illinois, mostly at backyard feeders during late summer months, highlighting the occasional long-distance dispersal events these birds can undertake.
Physical Description
Ruby-throated Hummingbirds are small birds, measuring about 7 to 9 cm (2.8 to 3.5 inches) in length, with a wingspan of approximately 11 to 13 cm (4.3 to 5.1 inches), and weighing between 2.5 to 6 grams. Males are especially striking, featuring a brilliant iridescent ruby-red throat patch, commonly called a gorget, which can appear black in certain lighting. Their backs are a shimmering emerald green, and their tails are forked with white tips on the outer feathers. Females lack the red throat patch and instead have a white throat with faint streaking, a green back, and tail feathers that are banded with white, black, and gray-green.
The Rufous Hummingbird is slightly smaller, about 7 to 8 cm (2.7 to 3.1 inches) in length with a wingspan near 11 cm (4.3 inches) and weighs around 3 to 4 grams. Males display an intense orange-red throat and chest, contrasted with a bright rufous (rusty orange) back and flanks. Their tails are distinctly rufous with black tips. Females and juveniles have a green back and crown, with a white throat that may show faint spotting, and rufous tail feathers tipped in white.
The Allen’s Hummingbird closely resembles the Rufous but can be distinguished by its bright green back, as opposed to the Rufous’ coppery-orange. Males have an orange-red to yellow-orange throat, a green back, and a rufous rump, with tail feathers tipped in black. Females are similar to Rufous females but with subtle differences in tail pattern and coloration.
Broad-billed Hummingbirds are among the more colorful vagrants. Males have a glossy emerald green head, back, and chest, with a striking cobalt-blue throat and a red bill tipped in black. Females are less vivid, with a grayish throat and chest, a green back, and a white stripe above the eye. They measure around 9 cm (3.5 inches) in length.
The rarely observed Black-chinned Hummingbird males feature a black throat with an iridescent purple base, a green back, and a white breast. They are about 8 to 9 cm (3.1 to 3.5 inches) long and weigh roughly 3.5 grams.
Behavior & Diet
Hummingbirds are renowned for their extraordinary flight skills, including hovering, backward flight, and rapid darting maneuvers enabled by their unique wing anatomy. In Illinois, the Ruby-throated Hummingbird is a familiar visitor to backyard feeders and wildflower patches. These birds establish feeding territories rich in nectar-producing flowers and feeders filled with sugar water, which they aggressively defend, especially males during breeding season.
The diet of Illinois hummingbirds centers around nectar from a variety of native and cultivated flowers. Preferred nectar sources include trumpet creeper, bee balm (Monarda), cardinal flower, honeysuckle, and salvias. In addition to nectar, hummingbirds consume small insects and spiders to obtain essential proteins and nutrients. These tiny invertebrates are caught on the wing or gleaned from foliage and spider webs. This combination of nectar and insects supports their high metabolic rates and energetic flight.
Rufous Hummingbirds observed in Illinois exhibit similar feeding behaviors. They are particularly known for their feisty nature, often aggressively chasing away not only other hummingbirds but sometimes larger birds or small mammals from their favored feeding spots. This territorial aggression is a hallmark of the species, especially males defending flower patches or feeders during migration stops.
Other vagrant species such as the Broad-billed and Black-chinned Hummingbirds show comparable feeding habits but are rarely documented enough in Illinois to fully assess their behavior locally. However, in their typical southwestern and Mexican habitats, these species also depend heavily on nectar and small insects, often frequenting feeders when available. According to RSPB, this species is well documented.
Breeding & Reproduction
The Ruby-throated Hummingbird is the only hummingbird species known to breed regularly in Illinois. Breeding season begins shortly after arrival in April or May. Males arrive first to stake out territories and court females through aerial displays and vocalizations. Nests are typically built by females alone, usually on a slender horizontal branch or in a tree or shrub between 1.5 to 10 meters above the ground. According to BirdLife International, this species is well documented.
The nest is a tiny cup constructed from soft plant down, spider silk, and moss, camouflaged with lichens on the outside. The female lays two white eggs, each about 1 cm in length. Incubation lasts approximately 12 to 14 days, followed by a fledging period of another 18 to 22 days. Females diligently feed the hatchlings a diet of regurgitated nectar and insects. Once fledged, juveniles remain in the area for a short period before beginning their southward migration in late summer or early fall.
Other hummingbird species seen in Illinois, such as the Rufous and Allen’s Hummingbirds, do not breed in the state. Their appearances are limited to migration periods when they pause to refuel. Breeding for these species occurs primarily in the western U.S. and Pacific Northwest. There are no verified breeding records for Broad-billed or Black-chinned Hummingbirds in Illinois.
Conservation Status
Most hummingbird species found in Illinois, including the Ruby-throated Hummingbird, are currently classified by the International Union for Conservation of Nature (IUCN) as Least Concern. This reflects their wide distribution and relatively stable populations. The Ruby-throated Hummingbird, in particular, remains common and widespread across its range.
Nevertheless, these tiny birds face ongoing threats from habitat loss, climate change, and environmental pollution. Urbanization can reduce the availability of native nectar plants and suitable nesting sites. Additionally, the improper use of feeders—such as neglecting to clean them regularly—can lead to disease outbreaks. Pesticides and herbicides also pose risks by reducing insect prey and contaminating nectar sources.
For vagrant species like the Rufous and Allen’s Hummingbirds, conservation concerns are more localized in their primary breeding and wintering grounds. Rufous Hummingbirds, for example, have shown some population declines in recent years, prompting conservationists to monitor habitat changes closely, especially in western forests and shrublands.
Citizen science efforts and bird monitoring programs in Illinois help track hummingbird sightings and population trends, contributing valuable data that support conservation strategies. Backyard feeders, when maintained properly, provide vital supplemental food sources during migration and breeding seasons.
Interesting Facts
Hummingbirds are among the smallest warm-blooded vertebrates in the world, and the Ruby-throated Hummingbird is no exception. Weighing as little as 2.5 grams—less than a penny—these birds have a heart rate that can exceed 1,200 beats per minute during flight. Their wings can beat up to 53 times per second, enabling their unique ability to hover in place and even fly backwards, an ability rare among birds.
Illinois hummingbirds embark on remarkable migrations. The Ruby-throated Hummingbird, for example, undertakes a nonstop flight of up to 500 miles across the Gulf of Mexico during its spring and fall migrations. This journey is one of the most impressive feats of endurance in the bird world, especially given their tiny size and high energy demands.
The territorial aggression exhibited by hummingbirds, especially the Rufous Hummingbird, is notable. Despite their small stature, Rufous males are known to chase away birds much larger than themselves, such as orioles and even squirrels, from their feeding territories. This fierce behavior ensures access to vital nectar resources during their energetically costly migrations.
Another fascinating aspect is the iridescence of hummingbird feathers. This shimmering effect is not due to pigment but rather the microscopic structure of the feathers, which refracts light to create brilliant colors that can shift and change depending on the angle of view. This trait is especially pronounced in males, who use it to attract mates.
Finally, hummingbirds have an exceptionally high metabolism, requiring them to feed almost constantly during daylight hours. At night, they enter a state called torpor, a kind of hibernation that slows their metabolism and conserves energy until dawn.
Conclusion
Illinois may not be the first place that comes to mind when thinking about hummingbirds, but this Midwestern state plays an important role in the lives of several hummingbird species, especially the Ruby-throated Hummingbird, which breeds and migrates through the region. The occasional vagrant species add excitement and diversity to the hummingbird experience in Illinois, providing birdwatchers and nature enthusiasts with unique opportunities to observe these jewel-like birds. Understanding their classification, behavior, and conservation needs helps foster appreciation and protection for these remarkable creatures. Whether visiting a backyard feeder or exploring wildflower patches, Illinois residents are fortunate to witness the dazzling displays of hummingbirds, nature’s tiniest marvels.
