Cepphus Grylle is a species of seabird belonging to the family Alcidae. Known by several names, this bird can be called the black guillemot, tystie or sea dove in English, while in other languages it's named differently. In French, it's called guillemot de Troïl, in German, Teisti, and in Norwegian, Teist. In Greek, it's called ολοφυ δαμαλίδα (olofy damalida), and in Finnish, mustatiira. Regardless of the name, Cepphus Grylle is a fascinating bird with a black plumage and distinctive red feet. It's commonly found along the coasts of the Arctic and sub-Arctic regions, where it feeds on fish and other marine organisms.