For years, many people on the Mexican island of Cozumel believed one of the area's most elusive native animals had vanished for good. Then a tiny fox appeared near a roadside, giving residents and researchers their first confirmed look in more than two decades at a species many feared was already extinct. What happened? The animal at the center of the rediscovery is the Cozumel fox, which lives only on the island. According to A-Z Animals, it …