You swallow something when you put it in your mouth and use the muscles in your throat to pull it down into your stomach. The bird in the picture is swallowing a fish. You might also be interested in the bird by the same name.
Scientific name: family: hirundinidae
Swallows are part of a large family of birds found all over the world, with the exception of Antarctica. They eat insects out of the air while they are flying around. There are many different kinds of swallows, with different habits. Many swallows have a distinctive forked tail.