Giant Cowbird vs Great-tailed Grackle

In short

The Giant Cowbird and Great-tailed Grackle are both large blackbirds, but the Giant Cowbird is slightly larger with a more robust build. Key differences include the Giant Cowbird's uniform black plumage and the Great-tailed Grackle's long, keel-shaped tail and iridescent sheen.

Identification tips

1. Look for the Great-tailed Grackle's long, keel-shaped tail and iridescent sheen in males. 2. Note the Giant Cowbird's larger size and uniform black plumage. 3. Observe behavior: Great-tailed Grackles are more likely to display and vocalize prominently. 4. Consider habitat: Great-tailed Grackles are often in urban areas, while Giant Cowbirds associate with oropendola colonies.

Size

The Giant Cowbird is generally larger and bulkier than the Great-tailed Grackle, which is more slender with a notably long tail.

Plumage

The Giant Cowbird has uniform black plumage, while the male Great-tailed Grackle displays glossy black feathers with purple iridescence. Female Great-tailed Grackles are dark brown, unlike the uniform coloration of the Giant Cowbird.

Behaviour

Great-tailed Grackles are known for their flamboyant behavior and elaborate displays, whereas Giant Cowbirds are less conspicuous in their actions.

Habitat

Giant Cowbirds are often found near colonies of oropendolas and caciques, while Great-tailed Grackles are more adaptable, found in urban areas, grasslands, and near water bodies.

Voice

Great-tailed Grackles have a large and varied vocal repertoire, while the Giant Cowbird's vocalizations are less documented and not as varied.