As Richer said, likely just fighting for dominance. You can't send them for counseling or ask them to settle it with a good ol' fashioned thumb war so I'd just leave them be and see what happens.
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-Quinn
Man, n. ...His chief occupation is extermination of other animals and his own species, which, however, multiplies with such insistent rapidity as to infest the whole habitable earth, and Canada. - A. Bierce, Devil's Dictionary, 1906
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