R-S:
Rabbits (in general):
A colony, warren, bury, trace, trip of rabbits:
Domestic rabits:
A herd of rabbits:
Rabbits (hares):
A down, husk of rabbits:
Rabbits (jackrabbit):
A husk of rabbits:
Rabbits (young):
A litter, nest of rabbits:
A gaze of raccoons:
A young raccoon:
A kit:
A colony, plague, swarm, pack of rats:
A rhumba of rattlesnakes:
An unkindness, murder, storytelling, conspiracy, congress of ravens:
A pack of Red Pandas:
A herd of reindeer:
A crash, stubbornness of rhinoceroses:
A bevy of Roe deer:
A clamor, building, parliament of rooks:
A hill, lek of ruffs:
A maelstrom, band of salamanders:
A run of salmon:
A fling of sandpipers:
A family of sardines:
A nest, bed of scorpions:
A wreck of seabirds (skuas, gannets, albatrosses, penguins, terns, petrels, auks, gulls, etc.):
A team, huddle, crash of sea lions:
A harem, bob, rookery, pod, herd of seals:
A shiver, school, shoal of sharks:
A drove, flock, hurtle, down, fold, trip, pack of sheep:
A colony, race, drove of shrews:
A rout, walk, escargatoire, hood snails:
A host of sparrows:
A clutter, cluster of spiders:
A roundup, audience of squid:
A dray, scurry, squad of squirrels:
A murmuration, chattering of starlings:
A fever of stingrays:
A mustering, muster of storks:
A flight, gulp of swallows:
Swans (in general):
A bank, bevy of swans:
A wedge (in flight) of swans:
A flock of swifts:
. . . .to be continued.