It is said that it is the closest to spiders in terms of classification.

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 have sensory organs called "taste buds" that allow them to search for food. When they spread their whiskers wide, they are looking for food.

Common bottlenose dolphins weigh approximately 260 kg.

Penguins live only in the Southern Hemisphere. Penguins are thought to be found only in cold areas, but they also live in warm areas.