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Sharks' Senses - Three Unique Ones That Make Them Unique

Sharks share many of the same senses that humans do, but they also have three unique ones (lateral line, pit organs and Lorenzini) that make it possible to detect sounds that we cannot.

When you see a shark in the water, remember that it is just living in its home.

What is a shark?

Sharks are fish – like all fish, they’re cold-blooded, have fins, live in the water and breathe with gills. But unlike bony fish, whose skeletons are made of bone, sharks’ bodies are built with cartilage. Their fusiform body shape reduces drag and makes them more efficient swimmers than fish with a more rounded, slender shape.

The cartilage also helps to make them lighter and more buoyant. In addition, sharks have large livers that are filled with low-density oil – helping them to achieve neutral buoyancy.

Sharks come in all shapes and sizes. Some bottom-dwelling sharks (such as angelsharks, cookiecutter sharks, wobbegongs) have flattened, elongated bodies that help them hide under the ocean floor; others, such as hammerhead and goblin sharks, have extraordinarily wide heads. And yet others, like bull sharks, have streamlined torpedo-shaped bodies that allow them to glide easily through the water.

Sharks are elasmobranchs

Sharks are a special category of fish called elasmobranchs, which also includes rays and skates. They have cartilaginous skeletons (the same clear gristly material that your nose and ears are made of), which make them much lighter than fish with bone skeletons, allowing them to move long distances using very little energy. Their livers are full of low-density oils, which helps them stay buoyant.

Sharks don’t have fingers to feel their surroundings, but they do have a system of pores that run along their skin from head to tail. When a shark moves, these pores send ripples through the water, and sensors inside their body pick up on them.

Scientists are now compiling the largest set of biologging data, revealing how 38 species of sharks, rays and skates move vertically through ocean depths. These discoveries can help scientists understand and protect the unique underwater habitats these animals depend on.

Sharks are omnivorous

Researchers from the University of California, Irvine, and Florida International University have sort of blown up the stereotype of sharks as exclusive meat-eaters. They found that bonnethead sharks, a type of hammerhead, eat seagrass – a flowering marine plant that creates sub-sea meadows in some coastal waters – for 60 per cent of their diet. And they do it by consuming the seagrass whole, not just its parts. Using blood and tissue chemistry, the scientists also confirmed that they digest the seagrass to extract nutrients from it.

Despite being portrayed as the quintessential bloodthirsty ocean predator in blockbuster movies, the world's largest sharks are the first known marine animals to be omnivorous. A study published in Proceedings of the Royal Society B reveals that whale sharks – which can reach more than 18 meters (59 feet) in length – eat a mix of small krill and seagrass. The omnivorous sharks are not only reclassified as omnivores but now rank among Earth's largest omnivores.

Sharks are carnivorous

As a carnivorous predator, sharks need to eat a lot of meat to survive. Their sharp teeth, cartilage skeletons and powerful muscles help them hunt and consume larger fish species, seals and sea mammals.

While most sharks are fierce meat-eaters, there are some that eat plants as well. For example, bonnethead sharks have been shown to consume seagrass in order to meet their dietary needs. This discovery is significant because it demonstrates that coastal sharks are not exclusively carnivorous and may play a stabilizing role in the fragile ecosystems they inhabit.

Other sharks are known to eat a variety of small and large ocean creatures, such as fish species, squid, crabs, lobsters and stingrays. They are also known to scavenge when necessary. Large sharks are known to prey upon dolphins, seals and sea birds as a source of nourishment. They will often target these species because they are weak or injured. As a result, these predatory sharks can have a negative impact on sea mammal populations in their area.