1) Hammerheads are marine and coastal, occasionally in brackish water.
2) They live in all the oceans, but especially in warm waters.
3) Their heads are very expanded sideways, with their eyes and nostrils much more widely separated than in other sharks; this cephalic structure is likely to increase their sensory capabilities.
4) They don’t have spiracles.
5) The giant hammerhead shark (Sphyrna) can exceed 6 m in length and weigh almost half a ton.
6) The range of the nine known species is 0.9 to 6 m long.
7) In general, they are light grey and have a greenish tone.
8) Their bellies are white, allowing them to be near the bottom of the ocean and mingle when they sneak up to their prey.
9) Their heads have side projections that give them a hammer shape.
10) The positioning of the eyes, mounted on the sides of the distinctive hammer, can give the binocular vision, as well as a vision of 360 degrees in the vertical plane, which means that you can see above and below them at all times.
11) The shape of the head can help the shark find food and allows a sudden turn of movement without losing stability.
12) Hammerhead sharks have seven senses.
13) One of them, which does not have human beings, is to detect waves of frequency caused by movements of fish and dives at great distances of the sea.
14) Another sense is to detect the electric fields generated by the fish so that they can find dams buried in the sand or at great distances.
15) Besides, his sense of smell he is capable of detecting a drop of blood at long distances.
16) They can form groups of more than one hundred hammerhead sharks.
17) At night, like other sharks, they become solitary hunters.
18) Since sharks do not have mineralized bones and are seldom fossilized, only teeth are usually found as fossils.By Barry Peters - Flickr, CC BY 2.0, Link