Most humans hurt other humans when they get mad. They could get into a fist fight,shoot a gun, and do many other things.
Crocodiles don't hurt humans on purpose. The will if they think that the humans are going to hurt them. If you don't bother them, they won't bother you.
The answer to this depends on if you are in a relationship/dating the other fellow. If you aren't a little competition may convince him to ask you out. If you are just friends with this fellow I doubt that you will hurt him. Go out with the fellow you asked you.
Humans hurt the earth more.
Antisocial.
yes it can be aggressice with it's other fellow creatures.
Humans hurt pelicans and other animals by accidentally spilling oil into the oceans. Also they are hurt by littering and pollution.
yes
yes
no
Penicillin injections certainly sting, the same as for humans.
yes
yes they do