Blue sharks are known for their distinct coloring, which allows them to blend in with ocean water. From above, the water appears darker and camouflages the shark's dark blue back, while its white underside resembles the sunlit ocean surface when seen from below. As a pelagic species, blue sharks inhabit the open water and often travel in large schools made up of only males or females.
The blue shark's body is gracefully contoured for rapid, fluid movement. Its slender form tapers to an elongated tail fin that bends from side to side, allowing it to swim about 35 kilometers per hour on average. Adult sharks often weigh over 240 kilograms and reach up to 4 meters in length.
Blue sharks enjoy a diet of octopus, squid and fish and some species of seabirds, but they are rarely preyed upon by other animals. Their serrated, triangular teeth grow in rows, which are regularly replenished in an eight-day to 10-day cycle.
Female blue sharks have skin that is approximately three times thicker than their male counterparts, preventing extensive injury when they are bitten during mating rituals. These aquatic creatures are pregnant for roughly nine to 12 months before giving birth to live young. An average litter contains 35 pups; as of 2014, the highest recorded number is 135, according to MarineBio.Learn More
Sharks are at the top of their respective food chain and are not usually hunted by other animals; however, sharks have been known to eat other sharks from time to time. There have also been a few sightings of moray eels eating small sharks.Full Answer >
Baby sharks are known as "pups." Already equipped with a set of teeth and ready for life on their own, baby sharks leave their mother immediately after birth.Full Answer >
The megalodon was a prehistoric shark species that went extinct at least 1.5 million years ago; the reasons the giant predators disappeared remain a mystery. Megalodons were not only the largest sharks to have ever lived, they were also the largest marine predator to ever swim the world’s oceans. While some propose that the sharks may still swim the world’s oceans, most scientists agree they are extinct.Full Answer >
Cookiecutter sharks, also known as cigar sharks, are unusual, small predators that commonly attack much larger prey. Their upper and lower teeth are quite different, with the hook-like upper teeth being much smaller than the triangular lower teeth. Their name comes from the circular holes they leave in their victims, which they cut out with the lower teeth and hold with their upper teeth as they swim away.Full Answer >