Table 1.

Ethogram of the behaviors recorded (adapted from Bolhuis et al., 2005) using scan sampling every 2 min for four consecutive hours in the afternoon

Behavior	Description
Inactive	Lying on floor, sitting, kneeling, or standing without performing any other behavior in the ethogram
Movement	Walking, trotting, running, scampering, or changing postures without performing any other behavior in the ethogram
Ingestion	Eating or drinking, interacting with feeder or waterer
Social	Touching or sniffing pen-mate; mounting pen-mate; pushing pen-mate out of feeder space; performing any manipulative behavior, such as belly nosing, nibbling, or suckling pen-mate
Aggression	Fighting, biting, head knocks, pressing, retreating from attack, or withdrawal
Exploration	Nosing, chewing, or otherwise manipulating floor or pen fixtures