This year experts at the International Union for Conservation of Nature (IUCN) have put together a list of the world's 100 most endangered animals and plants. These species are near the brink of extinction—each with a population that is dwindling fast—but also species that human beings have little use for. That's a problem because the calculus of conservation is increasingly being driven by economics. So IUCN's new list is dedicated to the highly endangered species that may be allowed to die out because they don't provide humans with clear benefits. But that doesn't mean they don't deserve to live.