| Continuous pairing |
Paired 24 hr/day with compatible cagemate |
| Intermittent pairing |
Paired ∼7 hr/day (usually paired by 8 a.m. and separated by 3 p.m.) with compatible cagemate |
| Continuous grate |
Paired 24 hr/day with a 1-in. mesh metal grate between cages, which allows visual, auditory, olfactory, and tactile/grooming contact between compatible cagemates |
| Intermittent grate |
Paired ∼7 hr/day (usually paired by 8 a.m. and separated by 3 p.m.) with a 1-in. mesh metal grate between cages, which allows visual, auditory, olfactory, and tactile/grooming contact between compatible cagemates |
| Singly housed |
Never paired but have visual, auditory, and olfactory contact with other animals in room |
