The natural plant and animal life of Liechtenstein displays a considerable variety because of the marked differences in altitude. A number of orchid species are able to grow because of the warmth carried by the Föhn. In the higher mountain reaches are such alpine plants as gentian, alpine rose, and edelweiss. Common trees include the red beech, sycamore, maple, alder, larch, and various conifers. Indigenous mammals include the deer, fox, badger, and chamois. Birds, including ravens and eagles, number about 120 species.