Collective Nouns

A quiver of cobras
A kine of cows (twelve cows are a flink)
A sedge or siege of cranes
A float of crocodiles
A murder of crows
A cowardice of curs
A dole of doves
A brace, paddling, or team of ducks

I've heard other words for some of these and always find this interesting. Well, OK, I'm an English teacher, and I like words.