FC, the birds are there for a reason - food. Lots of bugs in our part of the world this time of year, slow flying bugs the birds can easily catch and fatten up on during the nesting period, which is within the next few weeks. The swallows arrived at Perryville this past week, too - right after the bugs began appearing in larger numbers. The other thing that arrived is spiders, lots of spiders. They enjoy feasting on the bugs as well.