Unlike most bony fish

Although it is hard to test sharks' hearing, they may have a sharp sense of hearing and can possibly hear prey many miles away.[44] A small opening on each side of their heads (not the spiracle) leads directly into the inner ear through a thin channel. The lateral line shows a similar arrangement, and is open to the environment via a series of openings called lateral line pores. This is a reminder of the common origin of these two vibration- and sound-detecting organs that are grouped together as the acoustico-lateralis system. In bony fish and tetrapods the external opening into the inner ear has been lost.
Electroreception
Main article: Electroreception
Drawing of shark head.

Electromagnetic field receptors (ampullae of Lorenzini) and motion detecting canals in the head of a shark
The ampullae of Lorenzini are the electroreceptor organs. They number in the hundreds to thousands. Sharks use the ampullae of Lorenzini to detect the electromagnetic fields that all living things produce.[45] This helps sharks (particularly the hammerhead shark) find prey. The shark has the greatest electrical sensitivity of any animal. Sharks find prey hidden in sand by detecting the electric fields they produce. Ocean currents moving in the magnetic field of the Earth also generate electric fields that sharks can use for orientation and possibly navigation.[46]
Lateral line
Main article: Lateral line
This system is found in most fish, including sharks. It detects motion or vibrations in water. The shark can sense frequencies in the range of 25 to 50 Hz.[47]
Life history

Photo showing claspers of bottom-resting shark.

The claspers of male spotted wobbegong
Shark lifespans vary by species. Most live 20 to 30 years. The spiny dogfish has the longest lifespan at more than 100 years.[48] Whale sharks (Rhincodon typus) may also live over 100 years.[49]
Reproduction
Unlike most bony fish, sharks are K-selected reproducers, meaning that they produce a small number of well-developed young as opposed to a large number of poorly developed young. Fecundity in sharks ranges from 2 to over 100 young per reproductive cycle.[50] Sharks mature slowly relative to many other fish. For example, lemon sharks reach sexual maturity at around age 13–15