Eating animals is a good idea because generally the flesh of most animals is edible even if they eat plants that are poisonous to us. In a survival situation eating animal meat is generally safe unless it's something weird like a poison frog or a puffer fish or something. There are no poisonous species of bird. But if you're foraging for plant food there's a million ways you could accidentally kill yourself. This is why humans eat meat. Quit bitching.