Little Bee Eaters in Flight, Linyanti Concession, Botswana
These guys are called little bee eaters. They are fairly common throughout sub Sahara Africa. As the name would suggest, they eat bees, and these two were doing just that as they darted through the air.
Nikon D800 with Nikkor 200-400mm lens (at 400mm) ISO 400, f/4 at 1/1600th of a second