Zebras are very social animals and live in large, permanent family groups, with the group having a dominant male. The relations between the different herds are cordial, and the males have rituals of knowledge and acceptance. When they meet, males keep their ears up and smell other animals, especially the neck, flanks and tail. The Zebra plucks the grass with the help of the upper lip and the lower incisors. They are animals well equipped with large molars, they can process the most resistant plant material.