Animals fighting, animals bloodied and hurt, animals killed, dead bodies of animals, animals hunting, animals shown with blood after giving birth, animals trying to consume afterbirth and other unappetizing meals. Not as violent or gory as most normal animal documentaries.
Narrator often speaks of more violence than is ever shown and is sometimes quite graphic in his descriptions of what the animals could do to one another. For example, that a mother polar bear could rip someone who touches her cubs limb from limb and spread their entrails over the snow if she wished.
Some references to human death for comedic effect.