Because there are lots of old, big/tall trees in our neighborhood, we are over run w/squirrels and they can be a nuisance. Get in your attic, torment your dogs by standing on the windowsills, steal from bird feeders, etc. I don't advocate killing them. To be fair, they were here first, before the humans infiltrated.

Once the oaks start dropping acorns, the squirrels go nuts (sorry for the pun). They will sit in the trees and throw acorns at you. In a mad scramble to accumulate a good stash of acorns, many of them get even more careless about dodging cars. Lots of smooshed squirrels as a consequence. Darwin rules!

Was it the year before last when the oaks weren't producing many acorns in the DC area? We saw a big drop in the squirrel population as a result. Never fear, they are back in force (interestingly, more black ones than grey).