The only extant family of the suborder Tylopoda (order Artiodactyla). Currently living members include domesticated species, DROMEDARIES (with one-hump); BACTRIAN CAMELS (with two humps); LLAMAS; ALPACAS, and wild feral camels; VICUNAS; and GUANACOS. Although they get nutrients from plants by rumination, they evolved separately from the RUMINANTS which have four-chambered stomachs. Camelidae have three-chambered stomachs.