mammals just can be human eyes; for examplse photoreceptors are Rods and cones,
have single lens eyes which form an image
3 types of cone cells which detect colour (red. blue, green)... and what ever else about human eyes (function of cornea lens...)
insects have compond eyes consisting of...
HI... if anyone doing On giants shoulders in there HSC for imaginative jouneys.. and can find it in there hearts to share some of their thoughts, ideas and maybe ome notes please do... would be much appreciated