The gills of some sharks require constant movement in order for the water flowing over them to provide oxygen, but some sharks can move water through their respiratory system by pumping back and forth with their pharynx. They can therefore rest on the seafloor while still carrying on with their breathing.

Sharks can detect blood and are drawn to it. Although these are carnivorous animals, a small amount of blood is unlikely to elicit a shark-feeding frenzy. Contrary to popular belief, Sharks are not as fond of human blood as fish blood.

Baby sharks, like grown up sharks, have a full set of teeth. They become independent creatures as soon as they are born and swim away from their mothers. As a result, they are left to fend for themselves and their sharp teeth come in handy.

Goblin sharks are not dangerous at all, especially to human beings. Over the years, there have been rare reports of goblin sharks attacking humans unprovoked but this species is pretty harmless in general. It prefers to swim in deep waters and remains aloof for the most part. 

A killer whale lives on average for 30-50 years in the wild. The oldest one is between 65-80 years of age. Studies suggest female killer whales outlive male killer whales possibly up to 20 years longer. However, when in captivity their average lifespan is reduced. 

Whale shark teeth, one of the most common types of shark teeth, come in a wide variety of shapes and sizes depending on the species of whale shark. The teeth are used to crush up their food before swallowing it, and their flat tops make them perfect for grinding against mollusk shells like clams and oysters. The whale shark’s teeth are replaced throughout its lifetime.

Hammerhead sharks are among the most fascinating creatures of the sea. They are easily recognized by the unique shape of their heads, which are wide and flat with eyes that are spaced far apart. Hammerheads can be found in tropical, subtropical, and warm-temperate waters, as well as in the deep sea. Sharks are found in every ocean.

Sharks can have hollow teeth. In this case, experts agree that the majority of hollow teeth with missing roots are those that did not fully form in the course of the shark’s lifetime. 

notch on the proximal side of the tooth. These teeth are between 1/4 and 3/4 of an inch long and have a deep cleft. Their feeding requirements determine the shape and design of this fish’s teeth. 

Bonnetheads have a fantastic combination of sharp-edged and flat set of teeth that helps them handle both soft-shelled and hard-shelled prey. They are able to crush the harder-shelled animals with ease while using their sharp teeth to chew on soft prey.