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White sharks are often referred to as "cold-blooded killers," but they actually have the ability to warm their blood. Having the ability to keep their warmth helps them as predators as well. Another group of sharks, known as the mackerel sharks are able to warm their blood. These mackerel sharks retain their blood by using a heat exchange ...
Many sharks can contract and dilate their pupils, like humans, something no teleost fish can do. Sharks have eyelids, but they do not blink because the surrounding water cleans their eyes. To protect their eyes some species have nictitating membranes. This membrane covers the eyes while hunting and when the shark is being attacked.
Some sharks are so flexible, they can bend right around and touch their tails with their snouts. Shark skin is so rough that in the past it was used to make a type of sandpaper, called shagreen. Without their fins, sharks wouldn’t be able to stay the right way up. They’d roll over in the water. Most sharks never close their eyes.
Between April and September, scientists may observe around 600 breaches. The seals swim on the surface and the great white sharks launch their predatory attack from the deeper water below. They can reach speeds of up to 40 km/h (25 mph) and can at times launch themselves more than 3 m (10 ft) into the air.
Marks made by cookiecutter sharks have been found on a wide variety of marine mammals and fishes, and on submarines, undersea cables, and human bodies. It also consumes whole smaller prey, such as squid. Cookiecutter sharks have adaptations for hovering in the water column, and likely rely on stealth and subterfuge to capture more active prey ...
Few animals inspire the level of fear that sharks do, thanks to “Jaws” and other sensational tales of deadly encounters, and a steady stream of U.S. shark sightings has been the stuff of ...
Lateral line – sense organ that detects movement and vibration in the surrounding water; Shark cartilage – material that a sharks' skeleton is composed of; Shark teeth; Spiracle – pumps water across gills; Clasper – the anatomical structure that male sharks use for mating; Fish anatomy – generic description of fish anatomy
It’s that time of year again: the thick of summer when sharks have caught America’s attention. Americans are spotting more sharks in the water. Here’s why that’s a good thing