דברים יד:יד פירוש: דעת זקנים

ואת כל עורב, “and any species or sub-species of raven.” This bird too is not what is generally known as corbeau. (French) Upon examination, that bird has only two of the marks that would make it a pure bird. The subject is discussed in the Talmud, tractate Sanhedrin folio 108.