Vulture (IMAGE) Wildlife Conservation Society Caption Researchers developed the first method designed specifically to estimate population abundance from simultaneous counts of unmarked individuals over multiple sites, testing the methodology on three species of critically endangered vulture species in Cambodia. Credit WCS 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.