A somewhat rotund looking house martin in flight, seen from below. It has a very white fluffy looking belly and chin. Its upper body is blueish black, but only its cap can be seen here. It has a tiny beak. The bird is catching the sunlight, neatly outlining each individual feather on both of its wings, which re spread wide.
After the barn swallow (boerenzwaluw) and sand martin (oeverzwaluw) now the house martin (huiszwaluw) has also returned! A sizeable group was foraging above the lake. This is probably the roundest one I've ever seen. #birds