The red hive in the foreground and the green hive in the background are both exhibiting new hatches of bees. Notice most of the bees are taking short flights in little circles right at the hive entrances. These are known as orientation flights as the new bees get to know their surroundings. Soon these bees will begin taking longer flights.
Although the hives are slimming down in preparation for winter, it's good to see new bees and know that the queens are all alive and well.