View of polar bears in den at Detroit Zoo. Printed on front: "233, the bear den in Zoological Park, Detroit, Mich., 8A-H415." Printed on back: "Polar bears. In a den of sculptured rocks, splashing and swimming in their giant pool, these beautiful denizens of the Arctic wastes are a continuous source of entertainment. United News Co., 24 West Jefferson Avenue, Detroit, Mich. Genuine Curteich-Chicago 'C.T. Art-Colortone' post card (reg. U.S. Pat. Off.)"
