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Models of coordinated behavior of populations living in the same environmentare introduced for the cases when they either compete with each other, or theyboth gain by mutual interactions, or finally when one hunts the other one. Theequilibria of the systems are analysed, showing that in some cases thepopulations may both disappear. Coexistence leads to global asymptoticstability for symbiotic populations, or to Hopf bifurcations for predator-preysystems. Finally, a new very interesting phenomenon is discovered in one ofthese rather simple models. Indeed tristability may be achieved in thecompetition case, for which competitive exclusion is allowed to occur togetherwith populations coexistence.

Interacting population models with pack behavior