It is said that they cannot distinguish colors.

It varies from habitat to habitat, but can weigh from 150 to 650 kg.

Dolphins are classified as smaller than 4 meters in length, while whales are classified as larger.
However, there are exceptions and there is no clear standard.

They stay still in the cold deep sea to conserve energy as much as possible.

Penguins do not have teeth in their mouths. They have small soft spines on their upper and lower jaws to keep their prey from escaping.