Useless knowledge

Over on the right-hand side of this page, if you scroll down a bit, there is a box titled "Useless Knowledge". It has some random bits of interesting trivia which change each time you refresh the page. I liked the last one I saw. What do you call a group of animals?

A shrewdness of apes
A troop of baboons
A shoal of bass
A sleuth or sloth of bears
A sounder of boars
An army of caterpillars
A clowder or clutter of cats
A brood or peep of chickens
A clutch or chattering of chicks

A few of those have a strange poetry about them, but the others I wonder, "What were they smoking when they thought of that?"