Evolution is a continuous, powerful force shaping the natural world around us. As environmental pressures intensify, future animal evolution is likely to produce fascinating and sometimes bizarre new ...

On the many islands across the world’s surface, animals sometimes seem strangely different from those on the continents. Some become alarmingly small, while others grow alarmingly large. Biologists ...

Embryonic germ layers are the fundamental organizing principle in animal development. They provide the structural basis from which tissues and organs arise. During early embryogenesis, cells divide to ...