The temperatures are high today, June 19, and it is normal to think bees are swarming when you see bearding - when a population of bees crawl out of the hive to allow for ventilation being done by the fanning bees. Here are some photos from my apiary today:
Bearding 1
Bearding 2
Bearding 3
video sound of thermoregulation in progress - cooling the brood nest