Three-toed skink, Saiphos equalis. |
This example is an Australian skink which appears to be so finely balanced between egg-laying (oviparous) and live-young bearing (viviparous), that one individual has been observed doing both in the same pregnancy. Several weeks after laying a batch of three eggs, an individual three-toed skink, Saiphos equalis, was seen to give birth to a live young.
Examples of individuals reptiles of the same species being either oviparous or viviparous (bimodally reproductive) are rare but by no means unknown, however this is the first observed example of the same individual being able to be both. The three-toed skink is native to Australia's east coast. In the northern highlands of New South Wales it normally gives birth to live young but in the Sydney area, it lays eggs.