Shark Observation (Pt. 1)

Sharks have nostrils like humans but they don’t use them for breathing like we do. Their sense of smell is very useful for hunting. Sharks have seven senses the five that humans have and two more called lateral line system, which detects pressure variations and electrosensory system which detects electrical currents. Their electrosensory system is so sensitive and it can detect the electrical currents of a fish swimming in the water in the dark. Sharks eyes have the same basic structure as a human eye. Sharks are the only fish with eyelids. Their eyes are ten times more sensitive in low light than humans. Shark ears are just a tiny dot. They can hear about ten to 800 hz. Most sharks can rest and breathe but some others can’t. Some sharks such as Hammerhead Sharks have to keep swimming to breathe and if they stop swimming they will drown. Sharks that feed on fish have pointy teeth to eat slippery fish and swallow it whole. Sharks that feed on invertebrates have flat teeth for crushing prey.