Amid the tangle of mangrove roots on Havelock Island in the Andaman archipelago, India, a mudskipper (Periophthalmus sp.) rests between the arching roots of a Rhizophora mangrove tree. Perfectly adapted to an amphibious life, mudskippers use their pectoral fins to “walk” on land, while their protruding eyes scan both sky and water for predators. Thriving at the edge of two worlds, these remarkable fish are synonymous with the mangrove ecosystem.