Vegetation is sparse along the coast, but in the highlands and wadis, it is plentiful. Acacia, date palm, and many fruit trees are common. Many varieties of grapes are cultivated. Custard apple, euphorbia, and spurge grow in abundance. Alpine roses, balsam, basil, wild elder, and Judas tree are among the flowers and herbs. Wild mammals include the baboon, gazelle, leopard, and mountain hare. Scorpions and millipedes are everywhere, but snakes are less common. Many varieties of birds are found, including the bustard, hawk, vulture, raven, parrot, hornbill, honeysucker, and weaver finch. More than 27,000 varieties of insects and over 600 specimens of flowering plants have been collected in Yemen.