Romeo, the frog formerly known as the world’s loneliest, has joined more than 9,000 other species in National Geographic’s Photo Ark, an effort to document every captive species on Earth before they go extinct.

So has his potential mate, Juliet, whose recent discovery in the wild has sparked a sliver of optimism that the critically endangered Sehuencas water frog can survive.

Photo Ark founder Joel Sartore, a National Geographic Explorer, took portraits of the orange-bellied amphibians at their home in Bolivia’s Museo de Historia Natural Alcide d’Orbigny on January 19.

Living only in one small stream within Bolivia’s Andean cloud forests, or yungas, Sehuencas water frogs (Telmatobius yuracare) have plummeted in number due to habitat loss,