Biologists studying an Australian lizard observed something no one had ever documented in a vertebrate before. A single female produced offspring through two different reproductive methods during the ...

The genus Phymaturus, entirely viviparous and mostly herbivorous, inhabits the cold and harsh environments of the Andean highlands of Argentina and Chile, and the Patagonian steppe of Argentina.

Previous studies have shown both prolonged and plastic cycles in viviparous females of the genus Liolaemus (Iguania: Liolaemidae) from the cold temperate climate of Patagonia. Males have shown ...