The Common Yellowthroat, a small and sprightly songbird, is adorned with an olive back, wings, and tail. Its throat and chest radiate a vibrant yellow, contrasting with its white belly. The adult male is distinguished by a striking black face mask, extending from the neck sides across the eyes and forehead, elegantly framed by white or gray. Females, while similar, have paler underparts and lack the mask. Immature birds resemble the adult female, with first-year males sporting a faint mask that matures by spring.
Among the 13 races of Common Yellowthroats, variations are primarily seen in the males' facial patterns and the intensity of the yellow underparts, with southwestern forms being the most vivid. Key measurements include a length of 4.3–5.1 inches, a weight of 0.3 ounces, and a wingspan ranging from 5.9–7.5 inches.
These warblers favor marshes and wet areas with dense, low vegetation, though they can also be found in other dense shrub habitats. They are less commonly seen in drier locales.
The Common Yellowthroat is an abundant breeder across North America, from southern Canada to central Mexico, and is a rare vagrant to western Europe.
The Common Yellowthroat's song is a distinctive and emphatic "twichety twichety twichety twich," complemented by a soft "jip" call.
During the breeding season, these birds exhibit a preference for marshy habitats, where they engage in nesting and rearing their young. Males with larger masks are often preferred by females. These birds construct their nests in low vegetation, laying 3–5 eggs in a cup-shaped structure. Both parents are involved in feeding the young.
Their diet consists primarily of insects, which they adeptly capture in dense vegetation or occasionally in flight.
Despite experiencing a decline in numbers due to habitat loss, the Common Yellowthroat is currently classified as Least Concern, indicating that it remains a very common species.