Castoreum /kæsˈtɔːriəm/ is a yellowish exudate from the castor sacs of experienced beavers. Beavers use castoreum together with urine to scent mark their territory.[1][2] Both beaver sexes have a set of castor sacs and also a pair of anal glands, located in two cavities under the pores and skin among the pelvis and the base of the tail. : t

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