Grey-rumped Swift vs Sick's Swift

In short

The Grey-rumped Swift is distinguished by its grey rump patch and pale throat, while Sick's Swift is entirely brown. Both species are similar in size and shape, but their plumage provides the most reliable field mark for differentiation.

Identification tips

1. Look for the grey rump patch and pale throat on the Grey-rumped Swift. 2. Note the uniform brown coloration of Sick's Swift. 3. Observe the habitat; both species can be found near forested lowlands but check for nesting sites like chimneys for additional context.

Size

Both species are similar in size, typical of the Chaetura genus.

Plumage

The Grey-rumped Swift has a grey rump patch and a pale throat, contrasting with its otherwise blackish plumage. Sick's Swift is uniformly brown without any contrasting rump or throat coloration.

Behaviour

Both species exhibit similar swift-like flight patterns and are often seen flying over open areas.

Habitat

Both species are found in lowlands and foothills, often near forested areas. They typically nest in chimneys or similar vertical structures.