Late last fall I visited Pedernales, in the Southwestern corner of the Dominican Republic, with two young field biologists to see about a toad entirely new to science, yet unnamed, and apparently about to become extinct in the only place it's ever been seen. It's a circumstance that's not as unusual as it sounds. Many species get discovered only to disappear; a cousin of this toad was seen once in the Dominican Republic, in 1971, and never again. In this short piece for The New Yorker I describe our trip to meet the mystery toad and the rather harrowing slashing and burning going on in the only forests where it's ever been seen. Photo courtesy of biologist Miguel Landestoy.