This lopsided dentition, combined with the unusual ability to move the sides of their jaws independently, enables them to ...

Evolutionary advantage often makes for show-stopping stuff--a cheetah's speed, for example, or a moth's almost perfect mimicry of tree bark. In some snails, however, it's simply down to a poor fit ...

It was huge. Its light brown shell stood taller than the tip of my shoe. Its yellowish-green body stretched about an inch ...