דברים, פרק י״ד, פסוק י״ד

The family of forbidden birds presents a profound identification challenge, requiring scholars throughout history to carefully distinguish between permitted and prohibited species. The raven is a prime example of this complexity. While its name basically describes a black bird, the prohibition expands to include a much wider category. This encompasses the valley raven, which is surprisingly a white bird, as well as other species whose head structure resembles that of a raven or a dove, such as the swallow and the starling [אדרת אליהו].

A major issue discussed by scholars is whether the bird locally known to them as a raven is actually the one forbidden by the Torah. The primary approach among commentators is that the common raven found in their regions is not the biblical raven. This conclusion stems from practical anatomical examinations of the local birds, which revealed that they possess certain signs of permitted birds, such as an extra toe and a crop.

According to tradition, the true biblical raven possesses only two specific signs of purity. Finding additional pure signs in the local bird, combined with doubts about whether it acts as a bird of prey—a trait that strictly forbids a bird from being eaten—created a fundamental contradiction with the established rules of identification. Consequently, scholars concluded that the local bird could not be the biblical raven. Similar difficulties in matching physical traits, like a peelable gizzard and an extra toe, arose with other birds such as hawks and eagles, leading scholars to reject their commonly accepted identities as well.

Given the difficulty of relying entirely on physical anatomy to identify the raven, a unique behavioral marker is used to determine its true identity. The authentic biblical raven can be recognized by the fact that it spits during mating [דעת זקנים].