It was formerly classified as a subspecies of the Eurasian magpie ("Pica pica"). These results imply that the species "Pica pica" is not monophyletic. This applies to both sexes of "Pica pica", which carries similar monomorphic plumage. Coprophagia has also been observed in some people with schizophrenia and pica. Normally nests in stick nest of large birds, i.e. "Corvus", "Pica", raptors and "Ardea" herons. It is a form of pica, an eating disorder. Hairballs are often seen in young girls as a result of trichophagia, trichotillomania, and pica. It is a form of the disorder pica. The genus "Pica" was introduced by the French zoologist Mathurin Jacques Brisson in 1760. This deficiency in the patient's iron levels may have led to the increase Pica activity. The font length is measured there by the number of "characters per pica" (cpp). Leonardi and Pica (2006) found evidence supporting this claim. Kugler and Pica (2003) find similar results in the case of the Italian economy.