WHAT ARE THEY DOING?
It's called bearding, when the bees seem to form a fuzzy beard on the hive and hang out in a cluster. Almost all of the time this is totally normal, and even a healthy sign. You will see this in strong colonies when the population is at its height and as the bees are storing and ripening honey at a blinding pace. To keep the honey at correct temperature and allow for airflow in the hive, a small to large number of adult bees will hang out in the front, helping the internal temperature to stay cool. You might even see some fanning of their wings, pushing air into the hive on the hottest days.