When the environment changes dramatically, animals from mollusks to crows can make big changes in their behavior that enable them to survive. For example, marmots and ground squirrels in California ...

When people build cities and introduce invasive creatures, resident critter populations sometimes adapt Brian Handwerk | Science Correspondent Several species have evolved in response to human ...

The mystery behind why Alaskan horses, cryptodiran turtles and island lizards shrunk over time may have been solved in a new study. The new theoretical research proposes that animal size over time ...

700 million years ago, a remarkable creature emerged for the first time. Though it may not have been much to look at by today’s standards, the animal had a front and a back, a top and a bottom. This ...