Like you, a shark has nostrils. Unlike you, a shark uses its nostrils
for smell only (not to smell and breathe, like you). A shark's nostrils
are usually located on the underside of the snout. As it swims, water is
forced through the nostrils, and particles in the water trigger signals that
are sent to the brain.
A shark's sense of smell is many times stronger than a human's.
Sharks can detect the scent of prey that are up to several hundred yards away,
depending on the speed and direction of the water current. Some
sharks can smell as few as 10 drops of liquid tuna in the volume of water it
takes to fill an average swimming pool!
Like you, a shark has nostrils. Unlike you, a shark uses its nostrils
for smell only (not to smell and breathe, like you). A shark's nostrils
are usually located on the underside of the snout. As it swims, water is
forced through the nostrils, and particles in the water trigger signals that
are sent to the brain.