bearded lady lizard

Bearded dragon sex switched by heat. Similarly, the sex Australian central bearded dragons can be “switched” by heat.

A team of researchers led by Alex Quinn at Canberra University in Australia recently incubated eggs at relatively high temperatures – between 34°C and 37°C and found that the majority of embryos that had ZZ sex chromosomes (genetically male), went on to hatch as females.

The team is worried that the lizards may not be able to adapt fast enough to warming temperatures, leading to males being wiped-out altogether.

New Scientist, 31 Aug 2007