Groups of critters

Last year I found a website that listed the proper names for groups of certain animals, and some of them are really amusing. You have the standards, of course, like a flock of sheep (or birds), a herd of cattle (also llamas or deer), a pod of whales, a pack of dogs, but there are some that are really odd. Examples listed below... feel free to add some more.

Clowder of cats
Cuddle of kittens
Parliament of owls
Murder of crows (my favorite)
Intrusion of cockroaches
Colony of beaver
Obstinacy of bison (also my favorite)
Troop of kangaroo

And one more: creatively enough, you can have a group of guinea pigs. No kidding.