- . There are more than 400 diverse and unique species of sharks. Of all of them, half measure between 15 and 91 centimeters in length; and more than 80% of all sharks are smaller than humans. Less than 5% of them are giant size like the white shark, the whale shark and the peregrine, which can grow between 3.60 and 13.70 meters.
- . Humans pose a much greater threat to sharks than they are to us: overexploitation, finning and destruction of their habitat represent real damage to shark populations. The number of hammerhead sharks has decreased by 89% over the past two decades.
. When rubbing the skin of a shark from the tail to the head is extremely rough, since it is composed of dermal denticles, made of the same material as the teeth. Historically, many cultures used shark skin as sandpaper.
. Sharks can lose up to 1,000 teeth per year. These are constantly replaced throughout his life.
. Many sharks can see the colors. In addition to their excellent view, most of them have very sharp hearing and smell. They possess a unique sensory ability to detect electrical currents, using gel-filled pores called Lorenzini ampoules.
. Sharks do not have bones in the body. Their skeletons are composed of cartilage.
. The skin of a female blue shark is almost twice as thick as that of a male. It provides protection during the wild mating process of blue sharks.
. The spiny dogfish is one of the sharks that live the most, reaching between 70 and 100 years of age.
. The mouth of the whale shark can measure 2 meters wide, although it is usually fed with the tiny plankton.
. Sharks have the ability to learn qualified behaviors. In the scenario of an aquarium, they have been conditioned to respond to colored targets to receive food.