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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.
[citation needed] Most shark species have five gill slits on each side, however, some species can have up to six or seven like the sixgill sawshark and sharks in the order Hexanchiformes. [40] As part of their respiratory system, sharks also have an accessory respiratory opening called a spiracle behind their eyes. Spiracles are cartilaginous ...
A 5-metre-long (16 ft) basking shark has been calculated to filter up to 500 short tons (450 t) of water per hour swimming at an observed speed of 0.85 metres per second (3.1 km/h; 1.9 mph). [31] Basking sharks are not indiscriminate feeders on zooplankton.
A London-born photographer has captured the attention of social media users with his stunning photos of sharks. This photographer's stunning close-ups will change your opinion of sharks Skip to ...
A video showing multiple sharks swimming close to the shore just south of Myrtle Beach has gone viral, ... where it has since been shared over 230,000 times and racked up more than 42,000 comments.
Sandbar sharks usually have heavy-set bodies and rounded snouts that are shorter than the average shark's snout. Its upper teeth have broadly uneven cusps with sharp edges. Its second dorsal fin and anal fin are close to the same height. Females can grow to 2–2.5 m (6.6–8.2 ft), males up to 1.8 m (5.9 ft).
Close-up of zebra shark. The zebra shark has a cylindrical body with a large, slightly flattened head and a short, blunt snout. The eyes are small and placed on the sides of the head; the spiracles are located behind them and are as large or larger.
The hammer-like shape of the head means that hammerhead sharks can sweep for prey more effectively. The hammerhead sharks are a group of sharks that form the family Sphyrnidae, named for the unusual and distinctive form of their heads, which are flattened and laterally extended into a cephalofoil (a T-shape or "hammer"). The shark's eyes are ...