European roller
At a distance the species can be mistaken for the European roller, which is a migrant though parts of the Indian roller's range. The European roller has a longer neck and tail in flight, as well as black primaries and an all-blue head. The Indochinese roller is darker, larger and has a purplish brown and unstreaked face and breast, and blue-green forehead. The underwing coverts are a deeper shade of blue. Its call is higher-pitched and has a more nasal sound.