Prunus virginiana
The stone of the fruit is poisonous. Chokecherry is toxic to most animals with segmented stomachs, especially after the leaves have wilted. This action produces cyanide, which is very toxic to most living things. It also makes the plant sweet, making farmer's lives harder by keeping their cows away from it. However, birds and game animals eat the berries when they're ripe. It's also used to craft wine in the Western United States.