In honor of Endangered Species Day, held each year on the third Friday of May, we found some of the world’s most elusive creatures in the Atlas Obscura archive. Meet Puerto Rico’s wide-eyed frogs, Finland’s freshwater seals, and Indonesia’s singing dogs—and the scientists and citizens working to protect them. Puerto Rico’s Most Adorable Frogs Live in Caves and Fight Like ‘Gummy Bears’ by Hannah Tomasy Biologist Samantha Shablin is on a mission to learn more about the “cryptic” coquí guajón before it’s too late. This tiny and little-understood frog species,…
