Chilean Skua vs South Polar Skua

In short

The Chilean Skua is distinguished by its strong rusty tinge on the underwing linings and underparts, while the South Polar Skua lacks this rufous coloration and has a cold-toned plumage. Both species are similar in size, but the Chilean Skua often shows longer central tail feathers, suggesting 'jaeger tendencies.'

Identification tips

• Rusty plumage: Look for the rusty tinge on the Chilean Skua, especially on the underwing and throat.
• Tail feathers: Check for longer central tail feathers in the Chilean Skua.
• White 'skua flash': Observe the South Polar Skua for a white flash along the primary bases.
• Nape color: Note the buffy yellow nape in adult South Polar Skuas.
• Colony nesting: Chilean Skua nests in colonies, unlike other southern skuas.

Size

Both species are similar in size, typical of large skuas.

Plumage

Chilean Skua has a strong rusty tinge, especially on the underwing linings and throat, while the South Polar Skua lacks rufous tones and has a cold-toned plumage. South Polar Skua shows a white 'skua flash' along the primary bases and a buffy yellow nape in adults.

Behaviour

Chilean Skua is unique among southern skuas for nesting in colonies and catching a significant portion of its food in an 'honest' manner, similar to gulls. South Polar Skua's behavior is not specified in the notes.

Habitat

Chilean Skua nests in southern Chile and Argentina, migrating to Brazil and Peru. South Polar Skua's habitat is not specified in the notes.