Pangolin scales sample (IMAGE) Frontiers Caption The rats learned to identify and remember the scent of pangolin scales, elephant ivory, rhino horn, and African blackwood. These animals and plants are listed as threatened and at high danger of extinction. Image: APOPO Credit Image: APOPO Usage Restrictions Please credit creator 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.