Sharks
Six Senses
Sharks have all the same 5 senses as us humans except that they are even sharper ; smell, sight, taste, touch, hearing. They also have an extra 6th sense, electroreception. This 6th sense allows them to sense electric fields given off by prey. All living creatures give off an electric field that a shark can detect from your heartbeat and muscle movement. Larger sharks can detect a field from about 3 feet away; smaller sharks can only sense them from 6 inches.
To smell, water is forced though their nostrils as they swim, making particles trigger signals that travel to their brain. Sharks can smell the scent of their prey hundreds of yards away, depending on the speed and direction of the water current.
For a shark to taste something, it needs to be close enough to take a bite. A shark's mouth is lined with taste buds. Some sharks will eat anything, while others will only eat certain foods, according to the taste.
Sharks have a special strip of sensory cells called a lateral line. This is their sense of feel, a lateral line can sense vibrations in the water of prey. They can use this system to detect the motions of sick or wounded prey about 3-10 feet away that are easy to catch.
Sharks have excellent vision. They are about 10 times more sensitive to light than us. Some experiments show that they can see colours and that they may prefer bright or shiny objects. Many sharks can see their prey from 70-100 feet away. Some sharks have a lid that they use to protect their eyes from thrashing victims; others roll their eyes back into their sockets.
Although you may not have seen ears on a shark, they can hear sounds of up to 0.6 miles away (and they do have ears, although only internally). Sharks ears are extremely sensitive to low-frequency sounds made by sick or wounded prey.
These senses create the perfect predator.