For comparison, humans have an olfactory membrane of about 4 sq. The eyes of the chameleon can move independently. Therefore, it can see in two different directions at the same time. Cockroach Can detect movement as small as 2,000 times the diameter of a hydrogen atom. Crab Has hairs on claws and other parts of the body to detect water current and vibration.
Many crabs have their eyes on the end of stalks.
Dog Has olfactory membrane up to 150 sq. Can hear sound as high as 40,000 Hz. Dolphin Like bats, dolphins use echolocation for movement and locating objects. Can hear frequencies up to at least 100,000 Hz. Dragonfly Eye contains 30,000 lenses.