Rhinos, elephants, hunters, and mostly hippos. Lions, leopards, tigers, and jaguars can kill crocodiles depending on the size of the crocodiles.
teeth
Crocodiles will kill and eat lions as they see the lion as a potential food item. Lions, on the other had, will also kill crocodiles for the same reason.
they are trained to kill and survive
Hunters can kill crocodiles with shotguns and other kind of hunting guns. But it is very illegal to hunt down crocodiles in many places of the world.
Crocodiles are not good pets, reptiles generally aren't. Crocodiles are not truly domesticated and an adult crocodile can easily kill a human.
Yes, if they feel threatened.
alligators and crocodiles
yes to many people kill them
to get the meat and skins to sell.
Because they want the skin
Windmills can directly kill birds while dams blades can directly kill crocodiles.
They don't, unless they get caught in the crocodile's throat.