All animals need plants for food. Carnivores eat herbivores. They eat the herbivore's stomach.
I think that they are vegitarians and mainly eat bamboo so is unlikely for them to kill other animals as their prey/food.
First the octupus catches its prey till it has full control over it. Secondly it bites it with its beak. The beak then makes its prey fall in a doze or sleep. Then since its prey does not try to...
A predator.
they open there mouths and then close it again until the flood is mushy this then allows them to swallow it!