Pheasants are birds of several genera within the subfamily Phasianinae, of the family Phasianidae in the order Galliformes. Though they can be found world over in introduced (and captive) populations, the pheasant genera native range is restricted to Asia. Pheasants are characterised by strong sexual dimorphism, males being highly decorated with bright colours and adornments such as wattles. Males are usually larger than females and have longer tails. Males play no part in rearing the young. Pheasants eat mostly seeds, grains, roots, and berries, while in the summer they take advantage of insects, fresh green shoots, spiders, earthworms, and snails.