Shiny Cowbird vs Brewer's Blackbird

In short

To distinguish Shiny Cowbird from Brewer's Blackbird, focus on eye color and plumage iridescence. Shiny Cowbird has dark eyes and a more uniform glossy black plumage, while Brewer's Blackbird males have striking yellow eyes and iridescent violet and blue-green highlights.

Identification tips

1. Eye Color: Shiny Cowbird has dark eyes; Brewer's Blackbird has yellow eyes. 2. Plumage: Look for iridescent highlights in Brewer's Blackbird males. 3. Habitat and Behavior: Note the presence of Shiny Cowbirds near livestock and their parasitic behavior.

Size

Both species are similar in size, typical of medium-sized blackbirds.

Plumage

Shiny Cowbird males are uniformly glossy black with dark eyes, lacking the iridescent highlights. Brewer's Blackbird males have violet and blue-green iridescence, especially noticeable in sunlight, and piercing yellow eyes.

Behaviour

Shiny Cowbirds are brood parasites, often seen in open, disturbed areas and riding on livestock. Brewer's Blackbirds are social, often found in colonies, and have expanded their range significantly.

Habitat

Shiny Cowbirds prefer open, disturbed areas like agricultural fields. Brewer's Blackbirds are found in open habitats, farmsteads, and suburban areas, particularly in western North America.