Why do giraffes occasionally fight with their necks? "Necking" is a word that evokes a specific image in the human mind; the details may differ, but the overall sensation is pleasant, fun, or even nostalgic. Not the case with the normally gentle giraffe. Necking is the most violent and unpleasant experience they're ever likely to have. Giraffe males fight with their necks because it is their most powerful and maneuverable weapon. Bulls fight to gain dominance or the right to mate with the female

See what happens when an octopus grabs hold of a shark and won’t let go. | National Geographic Animals