Ptasie mleczko () is a soft chocolate-covered candy filled with soft meringue or milk soufflé. It is called ptichye moloko (птичье молоко, ) in Russian, lapte de pasăre () in Romanian, ptashyne moloko (пташине молоко) in Ukrainian, and linnupiim in Estonian. All these names literally mean "bird's milk" or crop milk, a substance somewhat resembling milk, produced by certain birds to feed their young. However, this is not the origin of the name; rather, "bird's milk" is an idiom of ancient Greek origin meaning "an unobtainable delicacy" (compare English: "").