Many physiological adaptations have evolved that make flight more efficient.

Superficial adaptations like skin color can evolve very quickly, in a matter of several thousand years.

At every stage in this predatory sequence, adaptations that maximize the prey's chance of survival have evolved.

Evolutionary psychologists suggest that psychological adaptations evolved to solve recurrent problems in human ancestral environments.

(possibly adaptations evolved along with their increased size).

This adaptation has most likely evolved in response to the overly aggressive nature of female spiders.

The message, as amplified by the exhibit's Web site, is that "key human adaptations evolved in response to environmental instability."

This important adaptation evolved twice from ancestral turtles which did not have this ability.

Since nest predation is common, several adaptations have evolved in this species.

It is theorized that this adaptation evolved because of our social nature as the eye became a useful communication tool in addition to a sensory organ.