Today I was contemplating the universe and stumbled upon a quandary.  We as humans have associated terms with the social structure and organization of the various creatures in the animal kingdom.  For example, wolves travel in packs whereas cows meander in herds.  What is the appropriate term for a group of gremlins?

Is it a...

...pack of gremlins?
...herd of gremlins?
...gaggle of gremlins?
...flock of gremlins?
...pod of gremlins?
...school of gremlins?
...swarm of gremlins?
...litter of gremlins?
...gang of gremlins?
...legion of gremlins?

(Obviously my thoughts don't run too deeply...)