Ruby-crowned Kinglet

The Ruby-crowned Kinglet (Corthylio calendula) is one of North America's smallest songbirds, renowned for its relentless motion, diminutive proportions, and exceptionally powerful voice. Despite weighing barely more than a nickel, this highly insectivorous acrobat thrives in dense forests and thickets. The male's signature scarlet crown patch remains hidden most of the time beneath olive-green crown feathers, flashed only during territorial skirmishes or mating displays.

Identifying a Ruby-crowned Kinglet relies heavily on behavior and facial traits because the namesake red crest is usually hidden.

• Size & Structure: Miniature and olive-drab, featuring a round body, short tail, very thin legs, and a needle-like black bill.
• Facial Markings: A bold, broken white eye-ring gives this bird a permanently "surprised" or wide-eyed look. The face lacks the dark, bold stripes seen on its Golden-crowned relative.
• Wings: Marked by two white wingbars, with a distinct thick, blackish bar immediately beneath the lower wingbar.
• Similar Species: The Golden-crowned Kinglet (Regulus satrapa) features a heavily striped black-and-white face and a permanently visible orange or yellow crown. Hutton's Vireo (Vireo huttoni) is remarkably similar in plumage but displays a thicker, hooked bill without a black base, lacks the black bar below the wingbars, has blue-gray legs, and moves at a significantly slower pace.

During the summer breeding season, these kinglets inhabit boreal evergreen forests of spruce, fir, and tamarack across Canada, Alaska, and elevated mountainous zones in the western United States.

In the winter, they migrate south to occupy the southern United States, Mexico, and portions of Central America. Wintering habitats are far more diverse, encompassing mixed deciduous-coniferous woodlands, brushy river valleys, neighborhood parks, and residential backyards.

The Ruby-crowned Kinglet's behavior is a key identification mark. Key aspects include:

• Wing-Flicking: As they forage, they hyperactively hop between twigs while continuously flicking their wings, a trait thought to startle resting insects.
• Feeding Habits: Often found gleaning insects, insect eggs, and spiders from the undersides of leaves and bark. They also hover at the tips of evergreen boughs and make flycatcher-like sallies to grab insects mid-air.
• Vocalizations: Their song is wonderfully loud and complex, starting with high, thin squeaks, transitioning to low chattering notes, and resolving into a loud, rhythmic warble. The call is a dry, chattering, two-note ji-dit.
• Nesting: The cup nest is composed of moss, lichen, and spider webs, suspended from twigs near the top of a conifer.