Black-Throated Blue Warbler vs Common Yellowthroat

Black-Throated Blue Warbler

Setophaga caerulescens

How to recognise a black-throated blue warbler?

General appearance

The black-throated blue warbler is approximately 13 cm in size, comparable to a sparrow. Its colors include black, blue, brown, tan, and white. The wing shape is rounded with a notched or square-tipped tail.

Male vs female

There are discernible differences between the genders. The male seems almost entirely black in shadows, with a white belly and a white spot on the wing. The female presents a more plain, dark upper body and buff lower body accompanied by a faint white wing spot and a dark cheek patch.

Juvenile

Younger females can be identified by the faint white wing spot which may not be as prominent as in mature females. Other physical traits and colorations are presumed to follow adult patterns, maturing with age.

Size

4.9 - 5.3 in/0.3 - 0.4 oz

Habitat

Primary habitat

The black-throated blue warbler primarily resides in dense woods with a rich undergrowth of shrubs and vine tangles. Its preferred forest types include maple, birch, beech, hemlock, spruce, and fir.

Additional range

During migration, they prefer shrubby or forested places. In winter, they inhabit dense tropical woods and also utilize man-made environments like fence rows and gardens.

Range Map

What do black-throated blue warblers like to eat?

Natural diet

The black-throated blue warbler primarily feeds on insects such as caterpillars, moths, and crane flies during the summer season. Spiders also constitute a part of their diet. In winter, their diet remains largely insectivorous, but they include seeds, berries, small fruits, and flower nectar in their diet to adapt to the changing availability of food sources.

Bird feeders

The black-throated blue warbler is known to visit bird feeders, specifically hummingbird feeders, where it consumes sugar water. This behavior suggests its adaptability to human-provided food sources when natural resources are scarce, particularly during colder seasons.

What does a black-throated blue warbler sound like?

The black-throated blue warbler produces a distinctive husky, rising zwee-zwee-zwee song. Its call pattern is flat but also exhibits a rising trajectory. The warbler showcases a variety of call types including a buzz, chirp or chip, a high-pitched tone, and a whistle. These varied vocalizations contribute to its unique sound repertoire.

Song

Audio by Gabriel Leite

/ CC BY-NC-SA 4.0

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Common Yellowthroat

Geothlypis trichas

Also known as: Yellow Bandit

How to recognise a common yellowthroat?

General appearance

The common yellowthroat is a small warbler with a round body and a short, sleek tail. Overall plumage is olive-brown with a bright yellow throat and breast, and white underparts. It has a distinctive black face mask across the eyes, bordered by a thin white or gray line.

Male vs female

Males are easily identified by their vibrant black face masks and brighter yellow throats, while females lack the black mask and have duller olive tones. Females may also show a less vivid yellow throat and a more uniformly olive-brown appearance.

Juvenile

Juvenile common yellowthroats resemble adult females but appear even duller, with more muted tones and a less pronounced yellow on the throat. They lack the black mask seen in adult males.

Size

4.3 - 5.1 in/0.3 - 0.4 oz

Habitat

Primary habitat

The common yellowthroat primarily thrives in swamps, marshes, wet thickets, and other extremely wet habitats with dense low growth.

Additional range

While they breed most abundantly in marshes, yellowthroats can also be found in moist brushy places, overgrown fields, and shrubbery along streams. In migration and winter, they can occur in any brushy or wooded area, though these are less preferred environments.

Range Map

What do common yellowthroats like to eat?

Natural diet

The common yellowthroat primarily feeds on a wide variety of insects, including small grasshoppers, dragonflies, damselflies, mayflies, beetles, grubs, cankerworms and other caterpillars, moths, flies, ants, aphids, and leafhoppers. It also consumes spiders and a few seeds.

Bird feeders

Common yellowthroats are infrequent visitors to bird feeders, as their diet mostly consists of insects and they prefer foraging for food in natural habitats like marshes, wetlands, and dense vegetation.

What does a common yellowthroat sound like?

The common yellowthroat is known for its distinctive vocalizations, primarily a loud and fast "witchity-witchity-witchity-witchity-wit" or "which-is-it, which-is-it, which-is-it." Additionally, it also uses a sharp "chip" call. The call pattern of this species is usually flat and undulating, with the type of calls being mostly chirp/chip and whistle sounds. The common yellowthroat song is typically marked by these unique calls and songs.

Call

Audio by Paul Marvin

/ CC BY-NC-SA 4.0

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Black-Throated Blue Warbler

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Common Yellowthroat

Black-Throated Blue Warbler

Setophaga caerulescens

General appearance

The black-throated blue warbler is approximately 13 cm in size, comparable to a sparrow. Its colors include black, blue, brown, tan, and white. The wing shape is rounded with a notched or square-tipped tail.

Male vs female

There are discernible differences between the genders. The male seems almost entirely black in shadows, with a white belly and a white spot on the wing. The female presents a more plain, dark upper body and buff lower body accompanied by a faint white wing spot and a dark cheek patch.

Juvenile

Younger females can be identified by the faint white wing spot which may not be as prominent as in mature females. Other physical traits and colorations are presumed to follow adult patterns, maturing with age.

Size

4.9 - 5.3 in/0.3 - 0.4 oz

There's more to learn about Black-Throated Blue Warbler

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Common Yellowthroat

Geothlypis trichas

Also known as: Yellow Bandit

General appearance

The common yellowthroat is a small warbler with a round body and a short, sleek tail. Overall plumage is olive-brown with a bright yellow throat and breast, and white underparts. It has a distinctive black face mask across the eyes, bordered by a thin white or gray line.

Male vs female

Males are easily identified by their vibrant black face masks and brighter yellow throats, while females lack the black mask and have duller olive tones. Females may also show a less vivid yellow throat and a more uniformly olive-brown appearance.

Juvenile

Juvenile common yellowthroats resemble adult females but appear even duller, with more muted tones and a less pronounced yellow on the throat. They lack the black mask seen in adult males.

Size

4.3 - 5.1 in/0.3 - 0.4 oz

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How to tell the Black-Throated Blue Warbler from the Common Yellowthroat

Visual differences

The Black-Throated Blue Warbler, averaging 5-5.3 inches in length, features distinct sexual dimorphism: males are mostly black with a white belly and wing spot, while females are dark with buff underparts. The Common Yellowthroat, measuring about 4.3-5.1 inches, is olive-brown with a bright yellow throat. Males have a distinctive black face mask, absent in females. Black-Throated Blues have a rounded wing with notched tail, while Yellowthroats display a round body with a short, sleek tail. Both species have small, sharp beaks, but the distinct face mask of the male Yellowthroat is a key identifier.

Key differences and behavior

The Black-Throated Blue Warbler and Common Yellowthroat exhibit distinct behaviors and preferences. The Black-Throated Blue Warbler often resides in dense woods and adapts to human environments during winter, while the Common Yellowthroat thrives in wet, brushy habitats like swamps and marshes. Black-Throated Blue Warblers can have multiple mates but often remain loyal to partners across seasons, whereas Common Yellowthroats are monogamous with hidden infidelities by females. When nesting, Black-Throated Blue Warblers choose thick shrubs close to the ground, while Common Yellowthroats nest low on dense vegetation in marshes. Dietary habits differ as well; the Black-Throated Blue Warbler feeds on insects, berries, and nectar, even visiting feeders for sugar water, whereas the Common Yellowthroat focuses on an insect-rich diet, rarely visiting feeders. These behavioral nuances aid in distinguishing the two species in their natural habitats.