Which books can help us after the killing of Cecil the lion?

After the heartbreaking death of Cecil the lion in Zimbabwe, the Book Doctor recommends children's books that explore the complexities of conservation and the threats to the natural world

My children were devastated by the killing of Cecil the Lion. They want to know about how animals in the wild can be protected. Are there any good books that might inspire them?

For your children the shocking incident of the killing of Cecil will be a spur to finding out more about how man fails to protect animals.