Mammals
Elephants
a parade
Parrots
a pandemonium
Frogs
an army
Fish in general
a draft, nest, run, school or shoal
Snails
a hood
Gorillas
a band
Eagles
a convocation
Turtles
a bale or nest
Herring
an army
Oysters
a bed
Moles
a labor
Ducks
a brace, team, flock (in flight), raft (on water), paddling
Toads
a knot
Trout
a hover
Flies
a business
Squirrels
a dray or scurry
Finches
a charm
Crocodiles
a bask
Clown fish
a watts
Jellyfish
a smack
Porcupines
a prickle
Buzzards
a wake
Cobras
a quiver
Sharks
a shiver
Lobsters
a risk