Mangrove Swallow

The mangrove swallow looks quite a bit like the tree swallow which I've posted on twice before (Salton Sea - May 1, 2021) and (Bear River MBR - August 14, 2021). We recently visited the Mayan ruins at Xunantunich in Belize and had to cross a ferry over the Mopan River to reach it. Mangrove swallows were flying all around the ferry and landing on it in various place. 

It has a white rump, which you can't see in my photo, a thin white line over the eye and white edging on the tertials which you really can't see either. 

Illustration from Birds of the World. 

Range from Birds of the World.