Did you know...
The skin of a shark is made up of "tiny teeth"
Which are called dermal denticles? This protects them from
the many parasites that try to attach themselves to the shark.
Did you know... it is true that some sharks will die if they can not move.
While moving, water passes through the mouth of the shark and
over the gills — this process is known as "ram ventilation".
While at rest, most sharks pump water over their gills to ensure
a constant supply of oxygenated water. A small subset of shark species
that spend their life constantly swimming, a behaviour common in pelagic sharks, have lost the ability to pump water through their gills. These species are obligate ram ventilators and would presumably asphyxiate if unable to stay in motion.
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