Criolla bullfrog (butter frog) (Leptodactylus ocellatus) at night, southern Pantanal, Mato Grosso do Sul, Brazil, South America

amphibian criolla bullfrog butter frog leptodactylus ocellatus night southern pantanal mato grosso do sul brazil endangered frogs sitting vertical brown outdoors nature natural world amphibians close up close ups frog bullfrog bullfrogs pantanal animals one amphibian looking at camera wildlife south america