Island of Corvo (IMAGE) Pensoft Publishers Caption The cliffs along the island of Corvo -- until recently it was unknown how many birds breed there. Credit Steffen Oppel Usage Restrictions CC-BY 4.0 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.