In general, most animals do not have a "proper" collective noun. Collective nouns as we know them were intended as a way for gentlemen to demonstrate their knowledge and also have a bit of fun. They were not meant for everyday use. In scientific literature, you will not usually find serious reference to these collective nouns.
The English language tradition of collective nouns can be traced back to the Book of Saint Albans.
The book contains, appended, a large list of special collective nouns for animals, "Company terms", such as "gaggle of geese" and the like, as in the article List of collective nouns. Amongst these are numerous humorous collective nouns for different professions, such as a "diligence of messengers", a "melody of harpers", a "blast of hunters", "a subtlety of sergeants", and a "superfluity of nuns". The tradition of a large number of such collective nouns which has survived into modern Standard English ultimately goes back to this book, via the popular 1595 edition by Gervase Markham in his The Gentleman's Academic.
Modern collective nouns follow the same whimsical and descriptive ideals.
Wikipedia is linked because this article and the related articles are well sourced. The relevant sources are books, not web documents, so I cannot link to them.