The Whale shark is about 90, pounds in weight. It detects motion or vibrations in water. Their eyesight is well adapted to the marine environment. The Hammerhead and Tiger shark can have as many as 40 babies at one time, while the others can have six to twelve. There are one or two fins present along the dorsal midline called the first and second dorsal fin.
Much of what we understand about prehistoric sharks comes from the study of their fossils. The pelvic fins are located behind the pectoral fins, near the cloaca, and are also stabilizers.
Weird things have been found inside a shark, such as a nail, a bottle of wine, a treasure chest, coats, a suit of armor, a drum and a torpedo.