Both human and non-human animals of course I assume? The current ones obviously. Life in general will probably be fine, it’s just the specific types of life currently inhabiting earth that are going to have a bit of trouble.
Good news for whatever gets the chance to climb to the top of the heap once mammals are gone. My money’s fungi but that’s mostly because I like Orks.
Metalheads are generally just nice people cosplaying as mean people. No nice person dislikes a kitty.