Colony of Thick-Billed Murres (image) Aarhus University Caption This image shows a colony of thick-billed murres on Kippaku, northwest Greenland. Historically, overharvest has been the largest threat to Arctic biodiversity, but with few exceptions, overharvest is no longer a primary threat to Arctic biodiversity. The marked decrease in populations of Thick-billed murres in Greenland is one of the worst remaining examples. Credit Knud Falk Usage Restrictions None 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.