Related Clues:

• Small and friendly crowd
• Bunch of hornets
• Bunch of bats
• First to speak with affectionate host
• Bee team
• Groups of bats or beavers
• Ants, collectively
• Group of gnats
• What a flash mob does
• Teem, as bees
• Buzzing cloud
• Bee ball?
• Large group of annoying types in school have trouble with headmaster?
• Workers and others, moving south, become less cold
• Group of bacteria, see, inside rabbit's fur