African elephants are evolving without tusks because of poaching

Many elephants at the Gorongosa National Park in Mozambique, Africa, are lacking one distinguishable feature that elephants usually have: tusks. Researchers believe the heavy presence of poaching has led elephants here to evolve without tusks, so their human predators have no reason to kill them and steal their tusks for ivory.It's not natural selection that is causing elephants to evolve without tusks, says Ryan Long, a researcher who has studied the elephants at Gorongosa National Park. It's a