Plants and animals are those common to the arid parts of Arabia. There is little vegetation except camel thorn in the desert and some shrubs along the coastal strip. Between October and March, however, when at intervals sufficient rain falls, the desert is transformed: grass and foliage are plentiful, flowers and plants appear in great variety, and in the spring truffles and mushrooms can be found. The fox and jackal have decreased in numbers; other mammals found in Kuwait include gerbils, jerboas, and desert hares. Reptile species include various lizards, geckos, and snakes. Fish are plentiful. Among the species of migratory birds are swallows, wagtails, chiffchaff, skylarks, wrens, eagles, cormorants, hoopoes, and terns.