Many aspects of the sharks biology and ethology are not very well known, above all because of the difficulty to study these fishes in their natural environment and for their bashful and solitary behavior.. Here you will find some questions about sharks life without answer..
It seem that the pressure practiced by the bite of a shark Carcharhinus obscurus of around two meters is three tons for square centimeter! To that value could arrive then that of a white shark of the length of seven meters?!
According to Walter Starck the
strips coloration white and black horizontal, that reproduces that
poisonous snakes of sea can be used as anti-shark protection in the
cases in which it is had to be to narrow contact with these animals (es:
taken back video, search, etc.).
The hammer shark Sphyrna lewini,
but also other species (Sphyrna
zygaena, Sphyrna tudes, Sphyrna tiburo)
usually solitary, has been observed to swim in numerous flocks. This
situation appens in the Red Sea, Costa Rica, Colombia, but also Hawaii,
South Africa and in the Mediterranean waters. These sharks don't have to
unite themselves in flocks to avoid the raiders, and probably they don't
even do it for reproductive motives.. Which is therefore the explanation??