Sharks
Shark is the popular name used to name the fish of the Condrichthyes group, that is, those that have predominantly cartilage. This group is also included as rays and chimeras. Sharks have inhabited the planet for 450 million years, 200 million years before the dinosaurs. There are over 465 different species of sharks!
Curiosities The smallest shark in the world is the lantern shark, reaching a maximum length of 20 cm. The largest is the whale shark, which can reach 20 meters in length. SHARKS DON'T SLEEP! To rest, they slow down their metabolism, stopping or swimming very slowly to expend less energy. Its coloring helps it in protection and predation! The dark skin on the back blends in with the sea floor when viewed from above; the lighter part of the body helps it to be camouflaged when viewed from below.