The coquí frog’s insistent calls echo off the walls of the cave. University of Florida biologist Samantha Shablin clambers over the rocky floor in hot pursuit. She can’t see the frog yet, but she’s getting closer. The frog calls again; the high-pitched, whistling notes might be mistaken for that of a bird. Finally, Shablin spots the animal. Switching her headlamp light to red to avoid spooking her quarry, she deftly scoops it into a plastic bag. Despite the impressive volume of its call, the frog is surprisingly small: only about…
