From Wikipedia: "About 140 kilograms of castoreum are harvested a year. An average beaver has 100 - 200 grams of castor sacs. So less than 2000 wild beavers ar

From Wikipedia: "About 140 kilograms of castoreum are harvested a year. An average beaver has 100 - 200 grams of castor sacs. So less than 2000 wild beavers are trapped and killed each year for castoreum, mostly in Canada - Eurasian beaver population levels are still too low for trapping to be effective."