Also, it would be interesting to know if egg- eating predators have been identified in the "viviparous" area, as that would provide an obvious strong selection reason behind the transition.
msg1 writes:
Along the warm coastal lowlands of New South Wales (map), the yellow-bellied three-toed skink lays eggs to reproduce. But individuals of the same species living in the state's higher, colder mountains are almost all giving birth to live young.
Or if the difference in the ecology\temperature\climate makes a difference.
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