The lesser white-fronted goose (Anser erythropus) is a goose closely related to the larger white-fronted goose . It breeds in northernmost Asia, but it is a scarce breeder in Europe. Winter visitor to Pakistan and Northern India. The lesser white-fronted goose is considered an endangered species, but there are programmes to reintroduce animals into the wild to strengthen the population. Additionally it is one of the species to which the Agreement on the Conservation of African-Eurasian Migratory Waterbirds (AEWA) applies. The two white-fronted goose species differ little other than in size (the lesser, at 53–66 cm (21–26 in) length and with a 120–135 cm (47–53 in) wingspan, is not much bigger than a mallard (Anas platyrhynchos) but both may be readily distinguished from the greylag goose by their bright orange legs and their mouse-coloured upper wing-coverts. The greylag goose has a flesh-coloured bill and legs, and the upper wing-coverts are bluish-grey.