A colony of small, black, flying mammals

 You don't want to get caught up in a swarm of these

 Snakes live in one of these, not necessarily in a tree!

 A __ of otters; it makes sense if you've seen them swimming

 A __ of buzzards, named similar to a party for a dead person

 A sleuth or sloth of large ursine mammals

 These bivalves are grouped in beds

 Known as a gaggle on the ground, or a skein in flight

 A __ of lions

 Flamingos usually do it on one foot; also the name for a group of them

 These stately birds grouped together are called a convocation

 These 'funny' mammals go about in a cackle or clan, laughing all the way

 A __ of crows; Alfred Hitchcock's "The Birds" comes to mind

 Not surprising that locusts travel in this biblical grouping

 You'd "shiver" if you ran into a group of these ocean predators

 A group of rabbits is called a __

 Seals and __ travel in pods

 Dog-like creatures that travel in packs

 A group of these fish are called an army, although a small one

 A tower of these long-necked animals

 These primates travel in bands

 A group of cheetahs can work together in a __

 You wouldn't want to be in front of a herd of __

 A smack of soft-bodied __ floating in the ocean

 Australian marsupials that travel in a troop

 Groups of these spiny animals make up a prickle

 A swarm or rabble of colorful winged insects

 A group of these big guys is called a crash; seems appropriate

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