Jakob can confirm, endangered species often try to look out for each other.
http://projectfuturecomic.com/heads.php?strip=01-01
http://projectfuturecomic.com/heads.php?strip=01-02
(FWIW this comic is very bloodthirsty - these specific pages aren't)
One of my favorite tropes is the good guy having a hard time explaining that the reason they're being nice to the bad guy is because they aren't a giant jerk.
"Why are you helping me?"
"Uhm, maybe because I don't want to see you DIE!?"