Why fly all the way from South America to spend a few months, then fly back again?
Because up here is where the insects are, the spring bug explosion, what's needed to raise the next generation.
Barn Swallows and Cliff Swallows, Iona Beach Regional Park.
Proof that there's a lot going on under the gray water of a pond, that the surface is a lively, living interface. The swallows aren't skimming the surface for nothing, or for fun--although it looks fun.