Hairworm in hand (IMAGE) Field Museum Caption A live freshwater hairworm in Bruno de Medeiros's hand in the Muir Woods National Monument in California. Credit Bruno de Medeiros Usage Restrictions Please include credit License Original 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.