It's a rainy day. The leaves are wet but they still want to play. The grounds are soaked, not a car moving in sight. Nothing to eat or curve an appetite. The buildings are drenched from the bottom to the top.
They want to see sun, but don't want the rain to stop.
Finally, they found a little puddle where they could play. As soon as the sun re-appears, they will stop playing and fly away.