But today some shark populations are on the brink of extinction. Shark meat is a popular food. And thousands of sharks are caught by accident, snagged in nets set out to catch other kinds of fish. Fun Facts 1. Sharks live all over the world, from warm, tropical lagoons to polar seas.
Sharks are fishes.
Like other fishes, sharks are cold-blooded, have fins, live in the water, and breathe with gills. A shark's skeleton is made of cartilage. Sharks eat far less than most people imagine. Studies on sharks in the wild show similar food intake. Only 32 shark species have ever been known to attack people.