This has long been my go-to for collective nouns. It suggests bed, knot, nest, pit, or trogle (?), but rattlesnakes get their own: rhumba.
I'm proud to have found so far no Google results for a suggestion of my own, a
goiter of jabiru.
I'm itching to read
Lipton's book. A score of bachelors, huh? But I love this site best because of the People category (a neverthriving of jugglers!), and especially because of something in the Some That Might Be category: a fraid of ghosts.