Thus Graba estimates that about one-fifth of the guillemots in the Faroe Islands consist of a variety so well marked, that it was formerly ranked as a distinct species under the name of Uria lacrymans.
Horrela Graba-k kalkulatzen duenez, Faroe irletako martinen bostenak hain aldaki nabarmenekoak dira, non lehenago espezie ezberdintzat sailkatzen ziren Uria lacrymans izenaz.