African Elephants (IMAGE) University of York Caption A review, which looks at 81 studies carried out between 1980 and 2020, has found that illegal hunting is causing worrying declines in the big mammal populations of protected areas across the globe, and particularly in poorer countries. Credit Dr Colin Beale, University of York 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.