The Rabb’s fringe-limbed tree frog, shown here, is one of 17,291 species threatened with extinction, according to an assessment of 47,677 animals and plants by the International Union for Conservation of Nature. The frog is found only in the mountains surrounding the town of El Valle de Anton in central Panama. Deforestation and a fungal disease are blamed for its decline. Only one male has been heard calling in the wild since 2006, and captive breeding efforts have so far proven unsuccessful, according to the IUCN’s “Red List of Threatened Species.”
Many conservationists say an extinction crisis is under way, driven by factors that range from overfishing and forest clear-cutting to global climate change. Amid all this doom and gloom, however, a bit of fleeting good news appears every now and again, when a species thought gone for good surprisingly reappears.
Learn eight of these stories. The endings may not be happy, but at least their stories are not yet over.