Even though they live in the ocean all of the time, dolphins are mammals, not fish.
There are 36 dolphin species, found in every ocean. Most dolphins are marine and live in the ocean or brackish waters along coastlines.
There are a few species, however, like the South Asian river dolphin and the Amazon river dolphin, or boto, that live in freshwater streams and rivers.
The largest dolphin, the orca, can grow to be over 30 feet long. The smallest, the Maui dolphin, is just five feet long.
When sleeping, half of a dolphin’s brain goes to sleep while the other half stays awake.
When sleeping, half of a dolphin’s brain goes to sleep while the other half stays awake.
Dolphins have two stomachs. One for storage and one for digestion.
A dolphin’s hearing is 10 times better than any human’s.
Dolphins are graceful, sleek swimmers that can reach speeds of more than 18 miles an hour.