Ruxandra Guidi, Balsa de los Sapos, EcuadorMarch 3, 2016
Until last year, the Cotopaxi volcano had been dormant for 140 years. If it does erupt, it could threaten one of Ecuador's most endangered frog species. The rocket frog isn't cute or cuddly, but it is hugely important to the local ecosystem. Biologists are hoping to save this ugly species from extinction.