19th century corvo for discussion

[fernando]

For plural we always use the S.

Castillian (so called Spanish):

Un (cuchillo) Corvo, dos Corvos.
Un (pajaro) Cuervo, dos Cuervos.

Portuguese:

Um (passaro) Corvo, dois Corvos.

Spanish Galician:(*)

Un (paxaro) corvo, dous corvos.

(*)
Galician (Galego) is often similar or equal to Portuguese.