What about protecting animals?

This is really a question of how much of the rights of a human do we give animals? Giving them no rights doesn't make sense from an ethical perspective as they have sentience and the capacity to feel pain. And yet we don't grant them the right not to be confined or killed, not just because it would make meat-eating humans unhappy, but also because rights are a human concept, and animals in nature are so horribly brutal that it seems incongruous to try and make humans not confine or kill them.