Table 1.

Behavioral Ethogram

Category and specific behavior	Measurement	Brief Definition
Coo Vocalization	Frequency	Clear soft, moderate in pitch and intensity, usually “oooooh” sounding
Freezing	Duration	Rigid, tense, motionless posture except slight head movement
Hostile Behaviors	Cumulative Frequency
Threat Bark Vocalization	frequency	Low pitch, high intensity, rasping, guttural
Threat (facial expression)	frequency	Any of the following: open mouth (no teeth exposed), head-bobbing, or ear flapping
Cage Aggression	frequency	Vigorously slaps, shakes or slams body against cage
Lunge	frequency	A quick, jerky movement toward the intruder
Motor Stereotypies	Frequency	Abnormal involuntary motor patterns (primarily involuntary leg movements)
aGrunt Vocalization	Frequency	Deep, muffled, low intensity, almost gurgling sound
aLipsmack	Frequency	Rapid movement of pursed lips, accompanied by a smacking sound
aFear grimace	Frequency	Refracted lips, exposed clenched teeth

List of all behaviors scored, how they are measured and a brief definitions.

^aIndicates that the behavior was never seen.