The pipits are generally highly conservative in appearance.Like all members of the family they are slender, short necked birds with long tails, long slender legs with elongated (in some cases very elongated) hind claws. The length of the hindclaw varies with the habits of the species, more arboreal species have shorter, more curved hindclaws than the more terrestrial species. Wagtails are a group of passerine birds that form the genus Motacilla in the family Motacillidae. The forest wagtail belongs to the monotypic genus Dendronanthus which is closely related to Motacilla and sometimes included therein. The common name and genus names are derived from their characteristic tail pumping behaviour. Together with the pipits and longclaws they form the family Motacillidae.