The female of the species is more deadly than the male.
Birds are absolute killers. Without a seconds hesitation they attack. After stalking. After watching. After planning. As someone said above, that’s a lot of work for such a small brain.
Yes. Their drive is to survive and reproduce.
(Have you ever seen house sparrows doing murder to get another pair out of a good nesting spot? If you’re a soft-hearted human-centric person, it’ll put you off birds forever...)