The vegetation of Guinea varies considerably. Dense mangrove forests abound along the coast and the riverbanks. The Fouta Djallon, which has been subject to considerable burning, is covered with sedge. The higher plateau areas have dense forests. Upper Guinea is characterized by savanna woodland. Trees include the shea and the tamarind. The Guinea highlands are characterized by dense rain forests.Animal life is extensive and varied. Snakes and crocodiles are common, and numerous species of tropical birds abound, including parrots and touracos. Mammals include leopard, hippopotamus, wild boar and antelope.