WJY GM

25/04/2022

16/04/2022

Living in arctic conditions affects the Greenland shark in a number of remarkable ways. For one, they move incredibly slow, at an average speed of fewer than one mile per hour. But their movement isn't the only thing slow about them; they also grow slowly. Adult Greenland sharks may reach up to 16 feet, but will only grow about one centimeter each year. At that rate, it takes about 150 years for a female Greenland shark to reach maturity. With such a slow growth rate, it's only natural that these sharks would have exceptional longevity, often living up to 400 years.Living in arctic conditions affects the Greenland shark in a number of remarkable ways. For one, they move incredibly slow, at an average speed of fewer than one mile per hour. But their movement isn't the only thing slow about them; they also grow slowly. Adult Greenland sharks may reach up to 16 feet, but will only grow about one centimeter each year. At that rate, it takes about 150 years for a female Greenland shark to reach maturity. With such a slow growth rate, it's only natural that these sharks would have exceptional longevity, often living up to 400 years.

16/04/2022

Greenland sharks are unique for many reasons, one of which is that they are the only species of shark that can survive in Arctic temperatures, according to Fisheries and Oceans Canada. These sharks mostly live in polar regions in the North Atlantic Ocean but have also been sighted at extreme depths of lower latitude oceans.

16/04/2022

The frilled shark is the stuff of nightmares, and not just because it looks like a beady-eyed eel. This deep-dwelling species of shark also has 25 rows of razor-sharp teeth. Their 300 triangular teeth are good for locking down on their slippery prey⁠—cephalopods, including octopus, cuttlefish, and squid. Because these sharks belong to a primitive species that has hardly evolved over millions of years, they're sometimes referred to as "living fossils."

16/04/2022

Sharks are growing new teeth all the time, too. In fact, many sharks are able to replace a lost tooth in a matter of days or months. As long as the shark stays healthy, it will continue to be able to grow unlimited new teeth for the rest of its life

16/04/2022

Unlike human teeth, shark teeth don't have roots, making them liable to fall out. Considering that some species may have as many as 300 teeth in their mouth at a time, that's quite a lot of tooth loss. In fact, some sharks may only have a tooth for about a week before losing it.

15/04/2022

Imagine eating whatever you wanted and never getting a cavity. That's the reality for makos and tiger sharks, whose teeth are naturally coated in fluoride, according to 2012 research published in the Journal of Structural Biology. All the better for maintaining strong, healthy teeth that can bite into all kinds of flesh.

15/04/2022

Sharks have been on this planet for hundreds of millions of years, yet fossils show little record of their existence. That's because they're elasmobranches, or species that have cartilage instead of bones, meaning most shark carcasses decompose before a fossil has time to form. Other elasmobranches include rays, skates, and sawfish. The only bones you'll find in a shark's body are its teeth, which it has plenty of