When I took biology I distinctly remember that the teacher said animals (not humans) have a "flight or fight" instinct, differentiating that with human reasoning about self-preservation and analysis of life and death. I find that to be true with the little lizards that run around the area. When I get near them if they're in my path, they run away. Since they freeze slightly in place, I may stamp my foot to frighten them, they then scoot away. I'm glad about that, I'm not thrilled to imagine they might impede my path.
Humans also have a desire to live, only I believe it is on a far higher level than that of a lizard or bird flying away in order to be safe. I say "I believe" because I also believe someone will say, "How do you know?" My answer? I figure that.
But they, like bees and ants, have fabulous qualities we humans do not have.