Large Tunnelling Dor Beetle (IMAGE) University of Helsinki Caption Large tunnelling dor beetles in the genus Geotrupes proved the most efficient decomposers. They remove dung twice as fast as do smaller dung-dwelling beetles and earthworms. Credit (Photo: Riikka Kaartinen) 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.