Mice have been collected from the bottoms of ravines on the island, rather than on the hilltops. (en.wikipedia.org)
Here, in the 40 - to 60 - foot depth range, divers can fit through deep ravines with walls 20 to 30 feet high, and explore maze - like networks of tunnels, caverns and arches that wind through the ancient limestone underpinning of the reef. (caradonna.com)