Castoreum in perfumery refers to the characteristic resinoid extract largely used as an animalistic note. The scent of castoreum is wild and bodily, lustful and passionate, bestowing the one who wears it a delicate aura of sensuality. This typical warm, carnal, and leather-like scent is actually a yellowish odoriferous oily secretion from the castor sac of the mature North American Beaver Castor canadensis and the European Beaver Castor fiber. The odor of castoreum is often described as sharp spreading a tar-like note that reminds of an odor of a birch tar or Russian leather. When diluted in alcohol, raw castoreum melts into more pleasant musky and fruity nuances.