Male Barn Swallows (Hirundo rustica)

How do I know? Well, he landed on another swallow's back just after this shot and they started 'making whoopee"!

I had tried unsuccessfully to capture one 'on the wing' for about an hour while my wife was out riding. My they are quick! I've added some other photos from today on the Flickr overflow. It was a most enjoyable day to be out.