Smaller birds, including songbirds, nuthatches, woodpeckers and flycatchers inhabit the surrounding pine forests. Among the birds are Bicknell's thrush and various songbirds and raptors. Songbirds, parrots, and other species are popular as pets. Monarchids are small insectivorous songbirds with long tails. The bulbuls are a family of medium-sized passerine songbirds native to Africa and tropical Asia. In Beijing, larks are taught to mimic the voice of other songbirds and animals. Cettiidae is a family of small insectivorous songbirds. The bulbuls are a family, Pycnonotidae, of medium-sized passerine songbirds. "C. arborescens" is used for nesting by several songbirds. Sexual selection among songbirds is highly based on mimetic vocalization. Anting to get rid of ectoparasites is another hypothesis for anting in songbirds. They also lack a pessulus, the bony central structure in the syrinx of songbirds. This is true especially among songbirds. They lack the sophisticated vocal capabilities of the songbirds. They do not have the sophisticated vocal capabilities of the songbirds.