Cassin's Finch vs Lesser Goldfinch

In short

Cassin's Finch and Lesser Goldfinch can be distinguished by size and plumage. Cassin's Finch is larger with a more robust bill, while the Lesser Goldfinch is smaller with a distinct black cap in males. Both species have different habitat preferences, with Cassin's Finch favoring higher elevations and Lesser Goldfinch thriving in a variety of environments, including urban areas.

Identification tips

1. Size and Structure: Cassin's Finch is larger with a heavier bill. 2. Male Plumage: Look for the black cap in male Lesser Goldfinch. 3. Habitat: Note the elevation; Cassin's Finch is more likely at higher elevations. 4. Vocalizations: Listen for mimicry in Cassin's Finch's song.

Size

Cassin's Finch is larger and more robust compared to the smaller, more delicate Lesser Goldfinch.

Plumage

Cassin's Finch males have a rosy red head and breast, whereas Lesser Goldfinch males have a black cap and bright yellow underparts. Female Cassin's Finches are brown with streaking, while female Lesser Goldfinches are duller with less streaking.

Behaviour

Cassin's Finch often mimics other birds and forms flocks in late summer. Lesser Goldfinch is adaptable and often found in human-modified landscapes.

Habitat

Cassin's Finch prefers higher elevations in the western mountains, while Lesser Goldfinch is found in a variety of habitats, including urban areas and agricultural lands.

Voice

Cassin's Finch has a warbly song with mimicry, while Lesser Goldfinch has a more typical goldfinch-like song.