Midwife Toad (IMAGE) Spanish Foundation for Science and Technology Caption The calls of the midwife toad and other amphibians have served to test the sound classifier. Credit Jaime Bosch (MNCN-CSIC) 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.