adj. Characteristic of or suitable to a creature, often specifically a non-human animal
the GNU version of the Collaborative International Dictionary of English
adj. Creatural; characteristic of a creature.
The Century Dictionary and Cyclopedia
Of or pertaining to a created or dependent being; having the character and limitations of a creature.
Word Usage
"And the distinction between "higher" and "lower" systems in the brain offers no relief: for I no more initiate events in executive regions of my prefrontal cortex than I cause the creaturely outbursts of my limbic system."