I was outside and my local mosquito eaters were putting on a show of their presence.
If you live in a mosquito area--at least if you are where these birds might reside, you really want to have a Purple Martin House. They arrive at approximately St Joseph's day (last third of March) in the spring, they chase out interlopers, they set up housekeeping and rear a brood, and they and their new generation hang around until it's time to migrate south again.
Purple Martins actually love to have apartment houses! You can have several pairs and they all live together. They even allow other birds to use the cubbyholes that they don't like. (English House Sparrows, mostly, where we are)