andorinha-dos-beirais-ocidental vs andorinha-de-peito-ruivo

The Western House Martin and Rufous-chested Swallow can be distinguished primarily by their plumage. The Western House Martin has a white underbelly and rump, while the Rufous-chested Swallow features a distinctive rufous (reddish-brown) chest. These differences are visible in flight or when perched.

Look for the white rump and underbelly of the Western House Martin, especially in flight. For the Rufous-chested Swallow, note the rufous chest and lack of a white rump. These plumage features are the most reliable for differentiation.

The Western House Martin has a white underbelly and rump, contrasting with its dark upperparts. In contrast, the Rufous-chested Swallow has a rufous chest and a more uniform dark upper body, lacking the white rump.