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Here is a pic of a pair of Knob-tailed gecko's Nephrurus Levis pilbarensis mating in the wild. If you look closely you can see the male biting onto the female's neck. I am not quite sure why he does this. I would imagine though, that he would do this because it would likely make it difficult for her to leave or may be he is doing this for extra support and perhaps leverage. It is very common to find this species with out their original tail as can be seen on the female in the pic. When they do grow their new tail back, it will no longer have the knob on the end of it, which is so characteristic of their name. The tail will also be without pattern. Clearly this ability to lose their tail and then regrow it back has been an extremely important adaptation which is so crucial to their survival.