My wife, Esme, spotted this small bright green tree frog on a riverbank in a canyon close to the town of Alto de Tio Diego. She called me so I could take several photos of this beautiful little amphibian. See A bright green treefrog gazing in the distance for another large photo of the same tree frog.
This photo is part of the blog entry Down the grassy slope to the river which has more photos of tree frogs and describes the habitat.