https://www.sciencedaily.com/releases/2020/08/200824105611.htm

The review, which looked at 81 studies carried out between 1980 and 2020, found that illegal hunting was causing worrying declines in the big mammal populations of protected areas across the globe, and particularly in poorer countries.

In the four continents included in the study, 294 different mammal species were discovered to have been illegally hunted in the national parks created to protect them.