adaptation
Amphibians Show That Shrinking Won't Always Avoid Extinction
Size does indeed matter, even for avoiding extinction, but not in the way many scientists have long suspected. A new study of amphibians argues that growing smaller to take up less resources won't always help a species avoid extinction in the face of a shrinking habitat, climate change, and disease. Instead, it is argued that dimorphism - where males and females are different sizes - give a species a better shot.