Collective nouns are the words used to define a group of people, animals or inanimate objects.
There are many collective nouns that refer to animals.
The use of 'nouns of assembly' or 'terms of venery' are collective nouns specific to certain kinds of animals. This stems from an English hunting tradition in the Late Middle Ages - originating in France.
Many of the words may have been chosen for the humorous or poetic images that they conjured up.
