bats.................colony
beavers...........colony
cranes.............sedge
crows..............murder
deer................leash (set of 3)
ducks..............brace (a pair)
eagles.............convocation
ferrets.............business
finches............charm
foxes...............skulk
geese.............gaggle
grouse............covey
hawks.............cast
larks...............exaltation
moles…..........company
nightingales....watch
plovers...........congregation
rabbit..............kindle
ravens............unkindness
snakes............den
sparrows.........host
starlings..........murmuration
swans.............sounder
toads..............knot
turkeys...........rafter
vipers.............nest
wolves............pack

Collective nouns are often used to describe groups of animals, whether they live in societies or come together at certain times, like migration:
Pop Quiz!

Do you know your collective nouns?