Feral equine populations are widespread, but wild equines are found only in Africa and Asia. Wild populations may have a harem system. In this case one adult male or "stallion", several females or "mares" and their young or "foals". Otherwise they live in a territory where males control territories with resources that attract females. In both systems, females take care of the foals, though males may play a role as well. Equines communicate with each other visually and vocally. Human activities have threatened wild equine populations and out of the seven living species, only the plains zebra is still widespread and abundant.