This is warning of what will happen when all the animals are gone. It is on the pile of dirt from digging graves.

These graves have several species of animals that are endangered. Rhinos, Black-footed Ferrets, along with many kinds of birds, turtles and more are in grave danger of disappearing forever.

This is the last grave dug by humans through the indiscriminate slaughter of other species. Without the other creatures, the world dies and takes us with it.