Arctic Warblers are small warblers with olive-green heads, backs, and sides. They sport a whitish eye line on the upper part of the eye extending from the bill to the back of the head.
Their breast and belly are whitish-yellow. They have a single, small, pale wingbar that’s unique among other warblers.
Both males and females look alike. However, their feathers molt and look a bit paler in the fall. So, instead of olive green, they look grayish.
- Phylloscopus borealis
- Length: 5 inches (13 cm)
- Weight: 0.4 oz (11 g)
- Wingspan: 7.75 inches (20 cm)
You can find Arctic Warblers in temperate regions of Alaska with forests of birch, willows, and spruce trees. During winter, they migrate to Southeast Asia and are known to have the longest migration route.
Arctic Warblers are insectivores, meaning their main diet consists of insects and other small invertebrates, like beetles, flies, caterpillars, mosquitoes, and many others.
Arctic Warblers’ Song:
Nests of Arctic Warblers are built by the female and located on the ground, protected by thickets of willow and birch. The nests are sphere-shaped and are where the female lays five to seven eggs that she incubates for about two weeks.
Arctic Warblers are known to have the longest migration route of any Old World insectivore.