Biopsy Dart (image) Wildlife Conservation Society Caption The scientists used biopsy darts to harmlessly collect bits of skin (and the genetic material needed for the study) from the whales. The small darts bounce off the backs of surfacing whales and then float, enabling the researchers to recover them. Credit T. Collins Usage Restrictions One-time usage only 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.