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Birds

birds A flock of birds (Standard term)
birds (small) A dissimulation of birds
auks colony (on land) / flock (at sea) / raft (on water)
bitterns A siege/sedge of bitterns
bullfinches A bellowing of bullfinches
chickens A peep of chickens
choughs A chattering / clattering of choughs
coots A covert of coots
cranes A herd of cranes
cranes A sedge of cranes
crows A murder of crows
curlew A herd of curlews
dotterel A trip of dotterel
doves A dole/dule of doves
doves (in flight) A flight of doves
ducks A badling or raft of ducks
dunlins a fling of dunlins
finches A charm of finches
geese (on the ground) A gaggle of geese
geese (in flight) A skein of geese
goshawks A flight of goshawks
grouse a pack or covey of grouse
guinea fowl A rasp of guinea fowl
hawks (tame) A cast of hawks
hawks (tame) A lease of hawks
herons A siege/sedge of herons
jackdaws A train of jackdaws
lapwings A deceit/desert of lapwings
larks An exaltation of larks
magpies A tiding of magpies
mallards A suit/sute/sord of mallards
nightingales A watch of nightingales
owls A parliament of owls
parrots a pandemonium of parrots
partridges A covey of partridges
peacocks A muster of peacocks
penguins a muster / parcel / rookery of penguins
pheasants A nide/nye of pheasants
pigeons (flying together) A kit of pigeons
plovers A congregation of plovers
ptarmigan a covey of ptarmigan
quail A bevy or drift of quail
ravens An unkindness of ravens
rooks A building/parliament of rooks
ruff a hill of ruffs
snipe A walk/wisp of snipe
sparrows A host of sparrows
starlings A murmuration of starlings
swallows A flight of swallows
swans A game of swans
swans (in flight) A wedge of swans
teal A spring of teal
turkeys a rafter of turkeys
turtle doves A dole/dule of turtle doves
wildfowl a bunch / trip / plump / knob (less than 30) of wildfowl
woodcocks A fall of woodcocks
woodpeckers a descent of woodpeckers
wrens A herd of wrens

Animals

a shrewdness of apes
a herd or pace of asses
a troop of baboons
a cete of badgers
a sloth of bears
a swarm / drift / hive or erst of bees
a herd / gang / obstinacy of buffalo
a drove of bullocks
an army of caterpillars
a clowder or glaring of cats
a herd or drove of cattle
a rag or rake of colts
a bask of crocodiles
a litter of cubs
a cowardice of curs
a herd or mob of deer
a pack or kennel of dogs
a school of dolphins
a herd or parade of elephants
a gang or herd of elk
a busyness of ferrets
a shoal or run of fish
a swarm or cloud of flies
a skulk of foxes
a herd of giraffes
a cloud of gnats
a flock / herd / trip of goats
a band of gorillas
a down / mute / husk of hares
a bloat of hippopotami
a drove / string / stud / team of horses
a pack / cry / kennel of hounds
a flight or swarm of insects
a fluther or smack of jellyfish
a mob or troop of kangaroos
a kindle or litter of kittens
a leap / lepe of leopards
a pride or sawt of lions
a stud of mares
a richesse of martens
a labour of moles
a troop of monkeys
a barren of mules
a yoke of oxen
a litter or herd of pigs
a pod / school / herd / turmoil of porpoises
a litter of pups
a string of racehorses
a crash of rhinoceros
a pod / herd / rookery of seals
a flock / herd / trip / mob of sheep
a knot of toads
a hover of trout
a bale or turn of turtles
a school / pod / herd / gam of whales
a sounder of wild boar
a destruction of wild cats
a pack or rout of wolves
a zeal of zebras

People

a bench of Bishops
a blush of boys
a sneer of butlers
a drunkship of cobblers
a hastiness of cooks
a stalk of foresters
an observance of hermits
a bevy of ladies
a faith of merchants
a superfluity of nuns
a pity of prisoners

Sources: wikipedia, oxforddictionaries.com