andorinha-do-barranco vs andorinha-dos-beirais-ocidental

The Sand Martin and Western House Martin can be distinguished by their underparts and tail shape. The Sand Martin has a brown breast band and a forked tail, while the Western House Martin has a white rump and a more squared tail. Observing these features in flight can help separate the two species.

Look for the Sand Martin's brown breast band and forked tail. The Western House Martin will show a white rump and more squared tail. These features are best observed when the birds are in flight.

The Sand Martin has a brown breast band and lacks the white rump of the Western House Martin. The Western House Martin is characterized by its white underparts and distinctive white rump.