Curiously, the female striped plateau lizard, which lives in the rocky slopes of Arizona's south-eastern mountains, is an exception to this rule in the animal world.

Pterin-based ornamental coloration predicts yolk antioxidant levels in female striped plateau lizards (Sceloporus virgatus). Journal of Animal Ecology , 2011; DOI: 10.1111/j.1365-2656.2010.01801.x ...

Female striped plateau lizards (Sceloporus virgatus), which live on the rocky slopes of mountains in southeastern Arizona, do this with bright orange patches underneath the jaw.

Female striped plateau lizards may be able to protect their eggs with microbes, a group of scientists is finding. Paraflyer/Wikimedia Commons (CC-BY-SA 2.0) ...