Yes Beaver Butt Is Delicious
Technically called castoreum, Castoreum is so favorably fragrant that we've been using it to flavor ice cream, chewing gum, pudding, and brownies -- basically, anything that could use vanilla, raspberry or strawberry substitute for at least 80 years.
Castoreum is also used primarily in fragrances these days, much like musks are used. Musk, like castoreum to beavers, is extracted from a gland near a deer's penis and adds depth and warmth to a fragrance giving it a sweet, leathery molasses evocation.
Both the Flavor and Extract Manufacturers Association and the Food and Drug Administration consider castoreum "generally recognized as safe," nontoxic if it gets in your mouth or on your skin, and in fact, has been used since the ancient days as medicines and perfumes.
Beavers use castoreum, which comes from their castor gland (not their anal gland, although the glands really are too close for our comfort under the tail), to communicate to each other: mark territory, deter predators, establish colonies, etc. When secreted, castoreum is "vicious, straw to brown in color, insoluble in water or ethanol, and has a heavy, pungent odor." A little less than 300 pounds is produced every year, which is stretched thin throughout the market. Because it's considered safe, the FDA doesn't require companies to specifically say they're using castoreum. They can just say "natural flavoring."