'...words like a "skulk" of foxes or a "murder" of crows...

This looks like the canonical place to trot out [again] that old joke about the four English professors who were approached by several "ladies of the evening" while strolling through Hyde Park. Pedantic as always, the scholars spent the next moments (after rebufffing the offer, of course) discussing what social phenomenon had just transpired.

"It was a flurry of strumpets," said the first.

"A jam of tarts," offered the second.

"An essay of trollops," chimed in the third.

"An anthology of pros," chuckled the fourth.

Whereupon a bystander, Cockney to the core, corrected them all: " 'Ell, no, Guvnors, it was just a feathering of 'ores!"