Most of the world's large herbivores - from elephants to gorillas, tapirs and sloths - are at risk of extinction, a new study shows. With most of these species in poorer countries, rich nations should dedicate substantial resources to their survival. But we must also lead by example - by reintroducing them ourselves.
The key to keeping ecosystems in good health is to maintain or restore populations of large carnivores, argues William Ripple. Yet around the world, these vital species are on the decline.
