This is the "Bamboo poison frog" from formerly known as Dendrobates biolat and now reclassified. It is an extremely small range endemic to the western Amazon lowlands, restricted to patches of giant bamboo. It was just described by science in 1992. These guys spend 90% of their lives within the interior water-logged bamboo compartments. They're super fascinating--but no touching.
Single individual photographed in habitat. This individual exhibits slight phenotypic variation from the typical "morph" seen in the pet trade. This individual was observed from a previously unknown population.
Yucatan casque-headed tree frog (Tiprion petasatus)
Uxmal, Yucatan, Mexico
I found this frog at around 6:00 pm. It was already dark. It was located in the wall, outside of its little hiding spot, right next to a banana tree. It's the first time I've ever seen one of this in real life, but I did know they usually hang around banana and lime trees :)