The blue-jeans frog

Also known as the strawberry poison-dart frog. We spent our day on the water at Tortuguero with a very knowledgeable young boat guide in addition to our regular guide; at one point, he moored the boat at the side of the forest and vanished into the undergrowth in search of one of these guys for us to look at up close! The leaf is a temporary home, in other words, sort of like something out of Beatrix Potter or The Wind in the Willows...
(Click for a bigger image.)