One of the craziest oddities of the English language is that there are so many different collective nouns that all mean "group" but which are specific to what particular thing there is a group of. For instance a herd of elephants, a crowd of people, a box of crayons, a pad of paper, etc. There is great diversity of collective nouns associated with animals, from a sleuth of bears to a murder of crows.

 Instant title and inspiration

With grateful thanks to:darknight-stock: wookiestock: lucias-stock: for the images.

:falln-brushes: noctourniquet: all on deviantart