The Black Island
Ranko is a gorilla who is used by Puschov, employer of Dr. Müller, to frighten inquisitive intruders away from "The Black Island", where forgers are printing counterfeit banknotes off the Scottish coast. At first, Ranko seems very fierce and bloodthirsty, but he is easily controlled by Snowy's barking, which terrifies him. He develops an affection for Tintin after receiving first aid from him for a broken arm. He is later sent to a zoo to be cared for.