Hummingbirds are among the most captivating and energetic birds found in North America, renowned for their iridescent plumage and remarkable flying abilities. In Wisconsin, Hummingbirds primarily make seasonal appearances, delighting birdwatchers with their dazzling displays and rapid wingbeats. While only a few species are regularly observed in this state, the presence of these tiny birds reflects broader migratory patterns and ecological dynamics. Wisconsin’s hummingbird visitors mainly comprise the native Ruby-throated Hummingbird, with occasional sightings of Rufous and Anna’s Hummingbirds, which are considered accidental or rare visitors. Understanding the species found here involves exploring their taxonomy, distribution, physical features, behaviors, and conservation status.
Scientific Classification
Hummingbirds belong to the family Trochilidae, which encompasses over 300 species worldwide, primarily distributed throughout the Americas. The species found in Wisconsin are members of distinct genera within this family, each with unique characteristics. The most common species in Wisconsin is the Ruby-throated Hummingbird (Archilochus colubris), a small migratory bird notable for its striking ruby-red throat in males. This species is the only breeding hummingbird in the eastern United States, including Wisconsin.
Rufous Hummingbirds (Selasphorus rufus) are another species occasionally recorded in Wisconsin, though they primarily breed in the northwestern United States and western Canada. These birds belong to the genus Selasphorus, which includes several other species known for their fiery coloration and aggressive territorial behavior. Finally, the Anna’s Hummingbird (Calypte anna) is a rare and accidental visitor in Wisconsin, typically more common along the Pacific Coast. This species is unique among North American hummingbirds for its vocalizations and elaborate courtship displays.
Geographic Range & Distribution
The Ruby-throated Hummingbird has a broad geographic range, breeding extensively throughout the eastern United States, southern Canada, and parts of the Midwest, including Wisconsin. These birds migrate southward to wintering grounds in Central America, primarily in southern Mexico and Panama. In Wisconsin, Ruby-throated Hummingbirds generally arrive in early May, with males usually preceding females to establish feeding territories. Their presence lasts through late September before they begin their southbound migration.
Rufous Hummingbirds primarily breed from southeastern Alaska to northern California, extending eastward into parts of the Rocky Mountains. Their migration routes generally follow the western coastline, making their appearances in Wisconsin unusual and categorized as accidental. At least 13 records of Rufous Hummingbirds exist for Wisconsin, often observed at feeders and gardens during late spring and summer months.
The Anna’s Hummingbird is largely a resident species along the Pacific Coast, ranging from southern Alaska to Baja California. Sightings in Wisconsin are rare and typically involve vagrants displaced during migration or by weather events. The expansion of Anna’s Hummingbird’s range in recent decades is notable due to climate change and adaptation to urban environments, but their presence in Wisconsin remains sporadic and unpredictable.
Physical Description
The Ruby-throated Hummingbird is a diminutive bird, measuring approximately 7 to 9 centimeters in length and weighing between 2.5 to 4 grams. Its wingspan ranges from 8 to 11 centimeters. Males are easily identified by their iridescent ruby-red throat patch, known as a gorget, which can appear black in low light. The back and crown are metallic emerald green, contrasting with a white chest and underbelly. Their tail is forked, with dark feathers edged in white. Females lack the red throat and instead have a pale, speckled throat with a green back and a tail marked with white, black, and gray-green bands.
Rufous Hummingbirds are slightly smaller, about 7 to 9 centimeters in length and weighing around 3 to 4 grams, with a wingspan near 10 centimeters. Males display a brilliant orange-red throat and belly, with coppery-orange backs and rufous-colored tails tipped in white. Females have a green back and crown and feature a whitish throat with speckles and rufous tail feathers that are also white-tipped. Their fiery coloration makes them unmistakable compared to the mostly green Ruby-throated Hummingbirds.
The Anna’s Hummingbird is one of the larger North American hummingbirds, measuring 10 to 12 centimeters in length with a wingspan of approximately 13 centimeters and weighing between 4 to 6 grams. Males exhibit a glossy, iridescent rose-red crown and throat, which can sometimes appear dark purple or nearly black depending on the light. The back is metallic green, with a grayish underside. Females have a more subdued appearance, with a green back, gray chest, white-tipped tails, and a spotted throat.
Behavior & Diet
Hummingbirds are renowned for their incredible flight capabilities, including hovering, flying backward, and rapid darting maneuvers. The Ruby-throated Hummingbird feeds primarily on nectar from a wide variety of flowering plants, shrubs, and trees, supplementing its diet with small insects and spiders for protein. These birds are territorial and often aggressively defend feeding sites, especially during migration and breeding seasons. Their high metabolism requires frequent feeding throughout the day, consuming nectar from flowers such as bee balm, trumpet creeper, and cardinal flower, as well as visiting hummingbird feeders provided by humans.
Rufous Hummingbirds share similar feeding habits but are known for their feisty and bold territorial behavior. They aggressively chase away other hummingbirds and even larger birds from their feeding territory. Their diet consists largely of nectar from tubular flowers like penstemons and columbines, as well as small arthropods. Rufous Hummingbirds are also notable for their long migratory journeys, with some individuals traveling up to 3,900 miles from breeding to wintering grounds.
The Anna’s Hummingbird exhibits unique behaviors among hummingbirds, including vocalizations that resemble songs, which are rare in this family. Males perform elaborate dive displays during courtship, producing distinctive popping sounds with their tail feathers at the bottom of the dive. Their diet consists mainly of nectar from urban and native plants, insects, and spiders. Anna’s Hummingbirds are highly territorial and known to defend feeding areas vigorously, sometimes even harassing humans who approach their favored flowers or feeders. According to Cornell Lab of Ornithology, this species is well documented.
Breeding & Reproduction
The breeding season for the Ruby-throated Hummingbird in Wisconsin typically begins shortly after their arrival in May. Males establish and defend territories rich in nectar sources to attract females. After mating, females build tiny cup-shaped nests made of plant fibers, spider silk, and lichens on tree branches or shrubs. The female incubates two white eggs, each about the size of a jellybean, for approximately 12 to 14 days. Hatchlings are altricial and remain in the nest for an additional 18 to 22 days before fledging. Females raise the young alone, as males do not participate in nesting or feeding. According to RSPB, this species is well documented.
Although Rufous Hummingbirds rarely breed in Wisconsin due to their typical western range, their breeding behavior is well documented in their primary habitats. Males court females with aerial displays and song-like vocalizations. Females construct nests from soft materials and carefully camouflage them with moss and lichen. The incubation period and fledging times are similar to those of the Ruby-throated Hummingbird. The species’ breeding success depends heavily on the availability of nectar-rich flowers and insect prey.
The Anna’s Hummingbird breeds primarily in the western United States year-round, with males performing dramatic aerial courtship dives accompanied by vocalizations and tail-generated sounds. Females build nests on tree limbs or shrubs, sometimes in urban areas, using soft plant down and spider silk. They lay two eggs, which hatch after about two weeks. The female provides all parental care, feeding the young until they fledge roughly three weeks post-hatching.
Conservation Status
According to the International Union for Conservation of Nature (IUCN), the Ruby-throated Hummingbird is classified as a species of Least Concern, reflecting its wide distribution and stable population trends. Nonetheless, habitat loss and climate change pose long-term threats, particularly through the reduction of suitable breeding and foraging habitats. Conservation efforts focus on protecting native plant communities and encouraging the use of native flowering plants in gardens to support nectar availability.
Rufous Hummingbird populations are currently stable and also listed as Least Concern by the IUCN. However, their extensive migratory routes make them vulnerable to habitat fragmentation, pesticide exposure, and climate variability. The presence of Rufous Hummingbirds in Wisconsin, though rare, underscores the importance of protecting migratory stopover habitats.
The Anna’s Hummingbird has experienced population growth and range expansion in recent decades, likely due to adaptability to urban environments and climate shifts. Currently, the species is also listed as Least Concern. Continued monitoring is essential to understand how urbanization and environmental changes might influence their distribution.
Interesting Facts
Hummingbirds are marvels of avian physiology, with wingbeats that can reach up to 80 beats per second during hovering. The Ruby-throated Hummingbird is the only species to regularly breed in the eastern United States, and some individuals undertake an extraordinary non-stop flight across the Gulf of Mexico during migration, covering distances up to 500 miles without resting.
Rufous Hummingbirds are renowned for their aggressive temperament, often dominating feeders despite their small size. This species holds the record for the longest migration relative to body size of any bird, flying from Alaska to Mexico annually. Their striking orange coloration makes them a favorite among bird photographers and enthusiasts.
The Anna’s Hummingbird is notable for its vocal nature, unique among North American hummingbirds, which generally produce minimal sounds. Males’ elaborate dive displays include high-speed swoops and mechanical sounds generated by tail feathers, a behavior that fascinates both scientists and birdwatchers alike. Additionally, Anna’s Hummingbirds have adapted well to urban environments, frequently nesting in city gardens and parks.
In Wisconsin, the appearance of these hummingbirds marks the changing seasons, signaling the arrival of spring and the ephemeral nature of summer’s warmth. Their presence encourages conservation efforts and fosters appreciation for the delicate balance of migratory bird ecosystems.
Overall, the hummingbirds found in Wisconsin, from the common Ruby-throated to the rare Rufous and Anna’s visitors, offer a window into the marvels of migration, adaptation, and survival. Observing these birds provides a unique opportunity to connect with nature’s rhythms and the remarkable life histories of some of the smallest yet most vibrant creatures in the avian world.
