Heart-stopping scene: Bird cleaning a crocodile's teeth.

The favorite food of the toothpick bird, also known as the Egyptian penguin, is insects and aquatic animals. But its preferred feeding spot is the mouth of a crocodile.

Video: Bird cleans crocodile's teeth.

When hungry, these birds will fly into the mouths of crocodiles, searching for food among the teeth of the swamp predator.

The crocodile also benefits from this behavior because food stuck in its mouth can cause infection, and the predatory birds inadvertently clean their teeth.

Therefore, when they need to clean their teeth, crocodiles will open their mouths and wait for the birds to come and help.