Why do we say that reptiles have uncommon senses?

 Reptiles can see, hear and smell like other vertebrates…yet they are quite extraordinary in some ways. For example, snakes and some lizards smell with their flickering tongues and a small organ located in the roof of their mouths, which is called Jacobson’s Organ. Some snakes are sensitive to infra red rays, which helps them to ‘see’ their prey even in total darkness. Marine turtles are able to travel vast distances by sensing magnetic fields. Generally speaking, the senses of vision and smell are well-developed in most reptiles, while their sense of hearing is poorly developed and they ‘hear’ by sensing the vibrations in the Earth.