Grassland, savanna, mixed bush, and scrub cover most of Swaziland. There is some forest in the highlands. Flora include aloes, orchids, and begonias. Large indigenous mammals include the blue wildebeest, kudu, impala, zebra, waterbuck, and hippopotamus; however, wildlife has become very scarce outside the protected areas. Crocodiles live in the lowland rivers. Bird life is plentiful and includes the European stork, sacred ibis, and gray heron.