Turtles, elephants, giraffes, and, most prevalent, images of Puerto Rico's beloved tree frog, the coqua.
The coqua is Puerto Rico's beloved tree frog. 
mnli hypothesis: The coqua is Puerto Rico's beloved tree frog.  premise: Turtles, elephants, giraffes, and, most prevalent, images of Puerto Rico's beloved tree frog, the coqua.