By Asher Elbein For decades, the native iguanas of Fiji and Tonga have presented an evolutionary mystery. Every other living iguana species dwells in the Americas, from the Southwestern United ...

"Their body metabolism is built for living ... and later opening the box to find it full of extremely active and jumping iguanas. "If nobody bothers them… chances are, they're gonna warm up ...

Around 34 million years ago, the ancestors of modern iguanas likely embarked on what ... resources or fat reserves maintaining an elevated body temperature,” McGuire said, referring to the ...