https://phys.org/news/2018-10-nature-assault-key-indicators.html

From 1970 to 2014, the number of animals with a backbone—birds, reptiles, amphibians, mammals and fish—plummeted across the globe, on average, by about 60 percent.

For freshwater vertebrates, losses topped 80 percent. Geographically, South and Central America have been hit hardest, with 89 percent less wildlife in 2014 than in 1970.