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Emperor penguins are the largest penguins. They stand 3 to 4 feet and weight up to 90 pounds.

Coral reefs tend to grow faster in clear water.The bluefin tuna can reach a top speed of 55 mph.

A dolphin's heartbeat slows as the dolphin dives. So does yours.

There are more than 350 species of shark; only 32 species have ever attacked people.

A manatee's teeth grow in the back of its mouth and move forward. This replacement process continues throughout a manatee's life.

A shark's entire skeleton is made of cartilage--not bone. Touch your nose; it's made of cartilage, too.