A strange thing is happening on some of the worlds most remote islands. From coastal California to the South Pacific, native birds, mice, turtles and foxes are emerging from the threat of extinction. 

Good news for conservationists but the methods some scientists are using to protect these endangered species is coming under fire. 

In her new e-book "Battle at the End of Eden," science writer Amanda Martinez highlights how far some scientists are willing to go to protect the world's rarest species.