Perfect summer's day

Today was truly the Glorious Fourth, a perfect summer's day, and the bees from both hives were flying fast in their bee-lines this afternoon; one would never know from the outside that the "red" hive had recently swarmed. When they're flying, they're quite noisy: BZZZZZZZZZZ... I have clover in bloom in the lawn; perhaps they're working clover in our several square kilometers?