never smile at a ….

Rising temperatures could force the birth of more female crocodiles and fewer males, an expert said today. The scenario could cause some croc populations to disappear.

Crocodile gender is determined by temperature during incubation. Nest temperatures of 89.6 to 91.4 degrees Fahrenheit (32-33 Celsius) result in males. Anything warmer or cooler produces females.

Temperatures typically vary from the top of a nest to the bottom, producing both genders.

LiveScience, 27 Nov 2006