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Mako sharks have very pointed teeth, while white sharks have triangular, serrated teeth. Each leave a unique, tell-tale mark on their prey. A sandbar shark will have around 35,000 teeth over the course of its lifetime!

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The blue shark displays a brilliant blue colour on the upper portion of its body and is normally snowy white beneath. The mako and porbeagle sharks also exhibit a blue coloration, but it is not nearly as brilliant as that of a blue shark. In life, most sharks are brown, olive, or greyish.

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Shark skin feels exactly like sandpaper because it is made up of tiny teeth-like structures

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Most sharks can see well in dark lighted areas, have fantastic night vision, and can see colours. The back of sharks’ eyeballs have a reflective layer of tissue called a tapetum. This helps sharks see extremely well with little light.

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Sharks have no bone. Sharks use their gills to filter oxygen from the water. They are a special type of fish known "elasmobranch", which translates into fish made of cartilaginous tissues—the clear gristly stuff that your ears and nose tip are made of. This category also includes rays, sawfish, and skates. Their cartilaginous skeletons are much lighter than true bone and their large livers are full of low-density oils, both helping them to be buoyant. Even though sharks don't have bones, they still can fossilize. As most sharks age, they deposit calcium salts in their skeletal cartilage to strengthen it. The dried jaws of a shark appear and feel heavy and solid; much like bone. These same minerals allow most shark skeletal systems to fossilize quite nicely. The teeth have enamel so they show up in the fossil record too.

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Generally, sharks are cylindrical in shape with tapered edges. This streamlined structure allows these carnivorous hunters to cut through the water in pursuit of their prey. Most sharks average a length of about 5.8 to 7 metres, much the same as human beings.