Pennant's Red Colobus Monkey (IMAGE) Drexel University Caption The Pennant's red colobus (Procolobus pennantii), a monkey species endemic to Bioko, is restricted to the remote southwest of the island. Pennant's red colobus is frequently listed among the most-endangered primate species in the world. It was not hunted as intensely as other Bioko monkeys in the BBPP team's study. Its isolation may have had a protective effect. Credit Araks Ohanyan/BBPP Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.