Elephant

New technology detects the shockwave of a supersonic bullet traveling through space, which cannot be muffled, to track poachers shooting at elephants and rhinos.

• By Marianne Messina

Ringling Bros.' decision to retire its elephants has been met with near-universal approval. Why do far fewer people care about the animals being slaughtered on a daily basis?

• By Wes Judd

The U.S. Fish and Wildlife Service says destroying ivory can reduce supply and demand at same time.

• By Lauren Kirchner

Restoring Africa's peace could be helped by restoring its fabled—and endangered—fauna.

• By Michael Todd