What caliber for coyote?

Damn things don't even wait until night to start calling.  They use the creek next to the house as a super highway, and so they're basically a nightly presence.  Now, I don't mind wildlife, but I have a philosophical objection to wildlife that has forgotten their place on the food chain.

So - hypothetically speaking, of course - if someone wanted to scare off the beasts, what would work?  Suppressed .22 (to avoid scaring the White Folks)?  Crossbow (arguably not illegal hereabouts)?  Game cam with built-in flash attachment?

Hypothetically speaking, of course.