Black-Throated Blue Warbler or Tennessee Warbler?

General appearance

The Tennessee warbler (Leiothlypis peregrina) is a small songbird with a wingspan of about 8.5 inches. It features an olive-green back, gray to whitish underparts, and a pale eyebrow stripe. The wings are relatively plain with no wing bars. It has a sharp, short bill ideal for feeding on insects and nectar.

Male vs female

Males and females are visually similar, but males may exhibit slightly brighter olive-green coloration, especially during the breeding season. Both sexes display the characteristic pale eyebrow and lack distinct markings on their wings, making them challenging to differentiate.

Juvenile

Juvenile Tennessee warblers look similar to adults but tend to have a duller overall coloration. Their underparts may appear slightly buffy, and their plumage lacks the bright luster of adult birds. These differences lessen as the bird matures.

Primary habitat

The Tennessee warbler's primary habitats are deciduous and mixed forests, especially balsam-tamarack bogs, aspen and pine woods, or edges of dense spruce forest. It nests near boggy ground depressions.

Additional range

During migrations, the warbler is found in groves and brush. In spring, it tends to be high up in trees, while during fall it can be found lower in saplings, brush, and weedy fields.

Natural diet

The Tennessee warbler primarily feeds on insects, with a preference for caterpillars, scale insects, aphids, beetles, flies, ants, leafhoppers, and spiders. During the summer, insects form the bulk of its diet. It also consumes nectar from catkins and juice from grapes. In the winter, while in tropical regions, its diet includes nectar, berries, and protein-rich structures produced by cecropia trees at the base of leaves.

Bird feeders

Typically, Tennessee warblers are not regular visitors to bird feeders. However, they might occasionally be attracted to feeders offering nectar or fruits suited to their preference for such natural food sources.