Did you know that a group of vultures has a sense of humour? Or at least the people who decided to name them did (likely back in the 16th century, when a slew of collective nouns emerged): While hanging out and doing nothing, vultures are called a committee. When feeding, they’re called a wake. There’s irony in them thar’ varmints.
Some collective nouns are common sense, and others simply common, such as packs of wolves, flocks of birds or herds of cattle; but did you know that lice flock, and sea urchins form herds, too? If I say swarm, you might think of flies or gnats or even minnows; but you could use the same word to describe a group of eels.
Worms bed, dotterels trip, cheetahs form a coalition, and Hippopotami bloat. Rhinoceroses either crash or form a stubbornness, while skunks stench and squirrels scurry. Jellyfish smack, brood or fluther, while oysters bed and goldfish glint or create a troubling. Butterflies flutter, swarm or kaleidoscope; caterpillars army, while grasshoppers cloud.
There are some fun combinations: Crows murder (they also gather as a storytelling or a parcel), Flamingos flamboyance, guillemots bazaar, gulls screech (don’t they, though?), and hawks kettle (flying in large numbers) and boil (two or more spiralling on an updraft). Hummingbirds charm, as do Magpies (unless they murder), and owls and rooks hold a parliament – I’d trust them to do so more than most politicians. Peacocks muster, ostentation and pride, while penguins tuxedo or huddle (I kid you not). Young penguins gather in a Créche, just like human toddlers, and seagulls squabble.
Starlings form beautiful murmurations and chatterings, while swifts scream and tigers ambush. I’d love to see a zeal of zebras, but not so much a prickle of porcupines. Whales pod while trout hover and stingrays fever; snails walk, frogs knot and, believe it or not, rattlesnakes rhumba! Elephants gather as a memory, while deer gang and bucks clash, and gnus form an implausibility. Running into a mob of kangaroos might be quite pleasant, but not an intrusion of cockroaches!
There are hundreds more such collective nouns; English is an ever-changing language, but some things are just too good to allow them to go the way of the Dodo, so add a few more colourful expressions to your language, and enjoy the idiosyncrasies of English!
I’ll just add that, by now, my grammar-checking program is having a nervous breakdown.