These trees are everywhere here. This one was growing next to a parking lot. The black ones are ripe, the red ones still ripening.

Black Cherry is a species of wild cherry native to the US. The berries are edible, but have an unpleasant aftertaste. So they're mostly used as an ingredient in other things rather than eaten on their own. They're used in jams and jellies, made into juice, used as a mixer for drinks, and are the inspiration for the taste of black and wild cherry candies and soda. Animals that like them are various birds and Black Bears, the latter of which often gorge themselves on the berries until the fall asleep in the trees.

The leaves, wood, and pits of the cherries, are poisonous. So it's advised not to let farm animals eat the foliage. Green wood should also not be used to roast food on, as that has caused sickness before. The pits can be safely swallowed whole or spat out, but should never be broken or chewed.

I've eaten Black Cherries myself, so can attest to the bad aftertaste. Mulberries are much better.