I love nomenclature like this. A “drift” of quail. A “siege” of herons. A “charm” of goldfinches. A “murder” of crows.
It all points to a time when people had a different connection with place, a complex knowledge of and taxonomy for describing flora and fauna.
For a great dictionary of these kinds of terms, not for birds but for general terrain, check Home Ground edited by Barry Lopez.
The following is taken from Wikipedia:
The standard collective noun for a group of birds of any type is a flock.
For a number of individual birds, there exist collective nouns particular to the type of bird. Many of these collective nouns are fanciful and not in common use in English. The book A Mess of Iguanas… A Whoop of Gorillas by Alon Shulman is a good reference for the collective nouns and their etymology. James Lipton’s book An Exaltation of Larks is devoted to these collective nouns, many of which originated as hunters’ terms and have been in the language for centuries.