(07-28-2012, 03:36 AM)Victor Leigh Wrote: It depends what the animal considers to be personal space. I have had dogs that think the best way to sleep is on top of each other. I also have had dogs that wouldn't let any other dog even sit near its bed.
Dog is a social animal. Their ancestors lived in packs. Social animals in general care less about personal space than loners.
While some fish are social animals too - ex: school fish who must live in groups, there are also equally many loner fish species. Most of the aggressive fish are loners.
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