I believe these creatures evolved with no need to speak aloud.

"Why would a creature evolve such natural weaponry, I wonder?"

Over the course of 555 million years, this creature evolved into several different subphyla.

How could a creature so specialized as a mosquito ever evolve?

Many other creatures evolve that share traits of multiple groups.

A few creatures have evolved greater complexity in the only direction open to variation.

The result was that its creatures only evolved when they had something to fight against.

The experiment confirmed what the plants already knew: that on earth, creatures evolve only when they have to struggle.

This creature had evolved by some logical and amazing plan.

As the creatures evolve, they become more human if not socialized.