Reptiles display three significantly different patterns of sex organ development. Lizards and snakes (collectively called squamates) have paired hemipenes. Turtles and crocodiles, including alligators and caiman, have a single penis and the tuatara have no copulatory organ at all.

Tuatara are ancient reptiles - they are sometimes called living fossils because they are the only survivors of a group of reptiles that roamed the Earth at the same time as dinosaurs. Tuatara have not changed much in 220+ million years. They are found only on 30 small islands in New Zealand. They have a mysterious third eye.

The tuatara was believed to be a lizard because it looks like one, but it is not. The tuara are endangered, a situation made worse by their slow breeding cycle, one of the slowest in reptiles.

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