TABLE 1.

Behavioral categories adapted from Platt et al. (2000)

Behavioral Categories	Description
Environment-directed:
Locomotion	Two or more directed steps in the horizontal or vertical plane
Object exploration	Tactile or oral manipulation of features of the observational arena
Foraging	Sweeping and/or picking through wood-chip substrate
Self-directed:
Self-grooming	Picking, scraping, spreading, or licking of fur
Scratching	Rapid movement of digits through fur in a rhythmic motion
Visual scanning	Directed eye and/or head movements, usually from a sitting position.
Vocalization	Any utterance including chirps, twitters, peeps, etc.
Resting posture	Species-typical posture associated with sleep: eyes closed, crouched on hind legs, hunched back, tail wrapped around upper body
Static posture procumbent posture	Maintenance of a rigid, atypical posture. Lying on cage floor or perch; loose-limbed