Pectoral fins aide in dive and lift control. The teeth are not attached to the jaw. A shark has many rows of teeth, which replace lost teeth by pushing them forward. The teeth of sharks are distinct to each species, making identification easier. Sexual Reproduction Unlike most fish, sharks copulate.
Male sharks have claspers that are inserted into the female for fertilization.
These are located near the pelvic fins. The first of young to hatch within the mother may eat the eggs, thereby getting an advantage at birth. Hawai'i sharks, who birth their young live, have a pseudo-umbilical cord attached to them. The caudal fin is extremely powerful. It is well-developed to ensure speed, since the tail is the sole means of propulsion.