Brainless? Not quite, even though you can see straight through the ears of the Gekko gecko. Tokay geckos are the largest geckos alive today measuring up to 35cm long.
Their bodies are somewhat flattened and cylindrical shaped. They have the remains of a third eye on the top of their heads which may be used as a coordinator between their activity an the light conditions. Their vertically-slitted pupils have eyelids that are fused together and are transparent. They have small holes on either side of their head and when looking through one of them it is actually possible to see straight through to the other side. However, these animals are far from brainless. They have a hearin