Maryland, with its diverse habitats ranging from coastal wetlands to forested uplands, offers an inviting stopover and breeding ground for several species of hummingbirds. These tiny, iridescent birds captivate birdwatchers and nature enthusiasts alike with their rapid wingbeats and dazzling colors. While Maryland hosts a handful of hummingbird species, the most commonly observed is the Ruby-throated Hummingbird, a true symbol of eastern North America. Additionally, occasional vagrant species add intrigue to the state’s hummingbird avifauna. This article explores the hummingbirds found in Maryland, detailing their classification, distribution, appearance, behavior, and conservation, providing an authoritative yet accessible guide for those interested in these remarkable birds.
Scientific Classification
Hummingbirds belong to the family Trochilidae, a diverse group of small birds known for their unique hovering flight and specialized nectar-feeding adaptations. Within this family, the species most commonly encountered in Maryland include the Ruby-throated Hummingbird (Archilochus colubris) and the Rufous Hummingbird (Selasphorus rufus). Occasionally, rarer vagrant species such as Allen’s Hummingbird (Selasphorus sasin) and Broad-tailed Hummingbird (Selasphorus platycercus) are reported, though these are not regular inhabitants of the state.
The Ruby-throated Hummingbird is the only hummingbird species that breeds east of the Mississippi River, making it the quintessential eastern hummingbird. It falls within the genus Archilochus, which is characterized by small size and a preference for temperate habitats during breeding. The Rufous and Allen’s Hummingbirds belong to the genus Selasphorus, known for their fiery rufous coloration and aggressive territorial behavior. Broad-tailed Hummingbirds, also in Selasphorus, are native to the western United States but sometimes wander eastward as rare vagrants.
Geographic Range & Distribution
The Ruby-throated Hummingbird (Archilochus colubris) is widespread across the eastern United States and southeastern Canada during the breeding season. In Maryland, these hummingbirds typically arrive in early May, with some early migrants appearing in late April. They remain through the summer and begin their southward migration by late September. Males usually arrive first to establish feeding territories and depart earlier than females and juveniles, who linger for approximately two more weeks. Their breeding range covers much of Maryland, especially areas with abundant flowering plants and feeders.
The Rufous Hummingbird (Selasphorus rufus), primarily a western species, is considered an uncommon but increasingly regular migrant in Maryland. While their main breeding range extends along the Pacific coast and the Rocky Mountains, Rufous Hummingbirds have been observed more frequently in the mid-Atlantic as vagrants. They tend to appear around the same time as Ruby-throated Hummingbirds, arriving in spring and leaving by early fall. These birds are often attracted to backyard feeders and gardens.
Rarer still are sightings of the Allen’s Hummingbird (Selasphorus sasin) and Broad-tailed Hummingbird (Selasphorus platycercus). Allen’s Hummingbird, native to the Pacific coast from southern Oregon to Baja California, appears in Maryland as an accidental visitor, with only a handful of verified records. Similarly, the Broad-tailed Hummingbird, which breeds in open mountain meadows of the western U.S., is a rare vagrant to the region. Such sightings are noteworthy events for birdwatchers and add to Maryland’s ornithological diversity.
Physical Description
The Ruby-throated Hummingbird is a diminutive bird, measuring approximately 7 to 9 centimeters (2.8 to 3.5 inches) in length with a wingspan of about 11 centimeters (4.3 inches). Adults weigh around 3 to 4 grams. The male is famous for its brilliant ruby-red throat patch, or gorget, which shimmers iridescently in sunlight. This striking throat contrasts with a white underbelly, an emerald-green back, and a slightly forked tail. The female lacks the red throat, instead showing a white throat and a green back with tail feathers that are banded white, black, and gray-green. This sexual dimorphism helps birdwatchers distinguish the sexes easily in the field.
The Rufous Hummingbird is slightly smaller, measuring 7 to 8.5 centimeters (2.7 to 3.3 inches) in length with a wingspan around 11 to 13 centimeters (4.3 to 5.1 inches) and weighing 3 to 4.5 grams. Males are unmistakable due to their glowing orange-red gorgets and rufous (rusty) backs and flanks, giving them a fiery appearance. Females exhibit more subdued coloring, with a green crown and back, whitish underparts, and rufous tail feathers with white tips. The Rufous Hummingbird’s coppery coloration, especially on the back, is a key field mark that differentiates it from the Ruby-throated Hummingbird.
The Allen’s Hummingbird resembles the Rufous but with distinct differences. Males have an orange-red to yellow-orange gorget, a bright green back (unlike the Rufous’s coppery back), and rufous rump and tail feathers tipped in black. Females are similar but typically show less rufous and more green on the upperparts. The Broad-tailed Hummingbird males are notable for their iridescent rose-red throat and metallic green back and crown, with rounded tail feathers that produce a distinctive whistling sound during flight. Females are paler, with white underparts and white-tipped tail feathers that are rust-colored near the base and blackish in the center.
Behavior & Diet
Hummingbirds are renowned for their agility and high-energy lifestyle, traits that are consistent in the species found in Maryland. The Ruby-throated Hummingbird exhibits remarkable hovering flight, achieved by rapid wingbeats—approximately 50 to 80 beats per second. These birds are territorial, especially males, who aggressively defend rich nectar sources such as flowering plants and backyard feeders. Their diet primarily consists of nectar from trumpet-shaped flowers, which provides the sugars necessary for their energetic flight. Additionally, they consume small insects and spiders, supplying essential proteins, fats, and minerals.
The Rufous Hummingbird is noted for its bold, aggressive behavior. It readily challenges other hummingbirds and even larger birds or small mammals at feeders. This assertiveness helps it secure feeding territories rich in nectar. Rufous Hummingbirds feed on nectar from a variety of native and cultivated flowers, including bee balm, columbine, and trumpet vine. Like the Ruby-throated, they supplement their diet with small arthropods, which they catch in mid-air or glean from foliage.
Vagrant species such as the Allen’s and Broad-tailed Hummingbirds display similar feeding behaviors during their sporadic visits to Maryland. Their ability to adapt to local nectar sources during migration or accidental appearances is crucial for survival outside their usual ranges. These hummingbirds are often attracted to feeders and gardens where nectar is readily available. According to Audubon Society, this species is well documented.
Breeding & Reproduction
The breeding season for the Ruby-throated Hummingbird in Maryland typically begins in late May and extends through July. Males arrive first to establish and defend territories rich in nectar and potential nesting sites. Courtship involves aerial displays with rapid dives and fluttering flights to impress females. Females build the nest alone, usually on a slender tree branch or shrub, often camouflaged with lichens and spider silk for flexibility and strength. The nest is an exquisite cup-shaped structure approximately 2.5 centimeters (1 inch) in diameter. According to BirdLife International, this species is well documented.
Females lay two tiny white eggs, each roughly the size of a jellybean, and incubate them for 12 to 14 days. After hatching, the female continues to care for the chicks, feeding them regurgitated nectar and small insects. The fledging period lasts about 18 to 22 days, after which the young leave the nest but remain near the territory for some time.
The Rufous Hummingbird has a similar breeding cycle but typically nests further west. Occasional breeding attempts in Maryland are rare and not well documented. Their nests are constructed similarly, with females solely responsible for incubation and chick rearing. The aggressive nature of Rufous males is particularly prominent during the breeding season, as securing high-quality territories increases reproductive success.
Conservation Status
According to the International Union for Conservation of Nature (IUCN), the Ruby-throated Hummingbird is currently classified as Least Concern. Its population is considered stable, benefiting from widespread availability of nectar-rich flowers and backyard feeders. However, habitat loss due to urban development and pesticide use can impact local populations. Conservation efforts focus on preserving native habitats and promoting pollinator-friendly gardening practices.
The Rufous Hummingbird is also listed as Least Concern by the IUCN, though its population trends have shown some fluctuations possibly due to climate change and habitat alteration in western breeding grounds. Its increasing presence in eastern states like Maryland may reflect shifts in migratory patterns. Continued monitoring is essential to detect any emerging threats.
Rare vagrants such as Allen’s and Broad-tailed Hummingbirds currently have stable populations in their native ranges but are vulnerable to habitat destruction and environmental changes. Their accidental appearances in Maryland are too infrequent to assess local conservation needs, but broader conservation of hummingbird habitat remains important.
Interesting Facts
One fascinating aspect of hummingbirds is their incredible metabolism. To sustain their rapid wingbeats and energetic flight, Ruby-throated Hummingbirds consume up to twice their body weight in nectar daily. They enter a state of torpor at night—a hibernation-like state—to conserve energy when food is scarce or temperatures drop.
Maryland birdwatchers occasionally report unusual sightings, such as an albino hummingbird spotted in Indian Head, Maryland in August 2016. This rare genetic mutation results in white plumage and pinkish beak and feet, a startling sight compared to the typical iridescent colors. Such reports highlight the diversity and occasional surprises in the state’s hummingbird population.
Another intriguing behavior is the “wing whistle” of Broad-tailed Hummingbirds. During flight, the shape and movement of their tail feathers produce a distinctive whistling sound, which serves as a communication signal or territorial display.
Furthermore, hummingbirds play a crucial ecological role as pollinators. Their feeding habits help transfer pollen between flowers, supporting the reproduction of many native plant species. This mutualistic relationship benefits both the birds and the ecosystems they inhabit.
Conclusion
Hummingbirds in Maryland, especially the iconic Ruby-throated Hummingbird, are a vital and enchanting part of the state’s natural heritage. Their dazzling colors, rapid flight, and ecological significance make them a favorite subject for birdwatchers and wildlife photographers. While the Ruby-throated Hummingbird remains the primary resident and breeder, occasional visitors like the Rufous, Allen’s, and Broad-tailed Hummingbirds add to the avian tapestry. Understanding their taxonomy, distribution, behavior, and conservation needs enhances appreciation and fosters stewardship. Encouraging native plant gardening and responsible feeder use can help support these extraordinary birds for generations to come.
