This small, greenish-yellow songbird can be found among the boreal, or forests of the northern U.S. and Canada, singing its buzzy "zee-zee-zee-zooo-zeet" song from the treetops.
Small for a songbird, with a thin, pointed bill and long black legs. They can be identified by their olive green and bright yellow feathers on their head and back, and black-and-white wings. Males have black throats and gray underbelly plumage; females have lighter coloring on their throats and black markings on their chest.
Around 4.3–4.7 inches (11–12 centimeters) long. They weigh between 0.3–0.4 ounces (8.5–11.3 grams), about the same weight as two nickels.
Deep inside northern forests with a mix of coniferous and broad-leafed trees. They make migratory stops in wooded areas and winter among mountain forests.
Males sing to establish their territory and attract females during the breeding season.
Black-throated green warblers fly quickly among the trees in search of insects to eat, often hovering to pluck their prey from the undersides of leaves. They also eat berries sometimes.
These birds migrate in the nighttime, so they are at risk for collisions with reflective buildings, telephone towers, and other man-made structures. Also, parts of their northeastern breeding grounds are threatened by deforestation and habitat loss.