Blackpoll Warbler

The Blackpoll Warbler is one of the larger warblers in its family. Breeding males are striking with their black and white coloring - they have a distinctive black cap on top, white cheeks with a black stripe, and gray backs streaked with black.

Their white underparts show bold black streaks along the sides. Two white wing bars stand out against their dark wings, and their tail has prominent white spots.

Females and non-breeding birds are more subtly colored, typically olive-gray to olive-green above, with dark streaks. They show pale stripes above their eyes and variable streaking on their underparts, which can range from whitish to having a slight yellow tinge.

Both sexes have dull orange to yellow legs and feet.

The Blackpoll Warbler's song is a simple series of high-pitched, thin notes on one pitch, often described as sounding like a tiny sewing machine. It's typically rendered as "tsi tsi tsi tsi tsi tsi tsi". Their call is a sharp, high "chip" or "tsip", often given during migration.

• Look for Blackpolls in spruce forests during the breeding season
• Listen for their high-pitched, insect-like song
• During fall migration, watch for them in mixed flocks in deciduous trees
• In the eastern United States, look for them in coastal areas during migration

Blackpoll Warblers primarily feed on insects and spiders. During the breeding season, they consume large quantities of spruce budworms, playing a crucial role in forest pest control.

In migration and winter, they supplement their diet with small fruits and seeds, which are especially important for fueling their long-distance flights.

Breeding occurs from late May to July. Males establish territories and attract females with their high-pitched songs. Females build cup-shaped nests, typically placed on horizontal branches of conifers, close to the trunk.

The nest is constructed with twigs, bark strips, and grasses, lined with feathers and fine plant materials. Females lay 3-5 eggs, which are white or creamy with brown speckles.

Incubation lasts about 12 days, primarily by the female. Both parents feed the nestlings, which fledge after 9-10 days. Fledglings remain dependent on their parents for several more weeks.

Blackpoll Warblers are known for their impressive long-distance migration, flying non-stop over the Atlantic Ocean for up to 88 hours, flying at speeds of around 27 mph (43 km/h).

During the breeding season, they forage actively in the upper canopy of coniferous forests, gleaning insects from leaves and branches with quick, agile movements.

The Blackpoll Warbler is listed as Near Threatened. While their remote breeding grounds are largely protected, they face several challenges. Climate change poses a significant threat to their mountain breeding habitats, with models suggesting that even small temperature increases could dramatically reduce available habitat.

During migration, they can suffer significant casualties from collisions with towers, wind turbines, and other tall structures. However, their ability to use various habitats means that tropical deforestation in their wintering grounds may be less critical than originally thought.