The mountainous regions of Morocco contain considerable areas of forest, including large stands of cork oak, evergreen oak, juniper, cedar, fir, and pine. Except for areas under cultivation, the plains are usually covered with scrub brush and alfa grass. On the plain of Sous, near the southern border, is a large forest of argan, thorny trees found principally in Morocco. Moroccan wildlife represents a mingling of European and African species. Of the animals characteristic of Europe, the fox, rabbit, otter, and squirrel abound; of predominantly African types, the gazelle, wild boar, panther, baboon, wild goat, and horned viper are common.