I leave 'em for the squirrels. I love pecans, but we've got none that I know of up here in Yankeeland.
The big tree I've got out front that I can never remember the name of? My little Pullet just informed me it's a Honey Locust.
I grew up with maples & pines, so not much else registers. Oops! I forgot sassafras. Used to smell them in the woods and let my nose take me right to 'em. Strip the bark off a small branch and chew it and it tastes just like root beer.
Got two huge apple trees and half a dozen crab apple trees, too. Sometimes the deer eat 'em, but most of the time it's squirrels.