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| Animals--Play behavior (1) |
| Defensive action (1) |
| Different-strain (1) |
| Laboratory rats (1) |
| Mixed strain (1) |
| Play behavior in animals (1) |
| Play fighting in rats (1) |
| Playful attack (1) |
| Rats--Behavior (1) |
| Same-strain (1) |
Now showing items 1-10 of 1