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"They were hunted for predominantly their fur but also for the castoreum which is an internal gland that was used for medicinal purposes and, until very recently, in perfumes," said Robert Needham, restoration manager at Beaver Trust.

To harvest castoreum, trappers kill beavers and remove their castor glands, which are dried and crushed.

They then use alcohol to extract castoreum, similar to how vanilla is removed from the plant, Francl says.

For over 2,000 years, people have turned to castoreum to cure all sorts of maladies, including fevers, stomach issues, and mental illnesses.

According to some of these sources, castoreum is an ingredient in everything from ice cream to strawberry-flavored oatmeal.