Emerald Glass Frog (Espadarana prosoblepon)

We found this frog during a night time hike in search of the Ghost Glass Frog at Yatama Ecolodge, a prime conservation reserve bordering Braulio Carrillo National Park. It acted very docile, barely moving its head down from the upward position it had when we found it. The easiest way to recognize it among the Glass Frog family is by the dark spots on an otherwise uniform green skin. Males feature a blue-green hook that seems to stem from the shoulder joint, faintly visible in the left-hand side picture below; one can only ask what purpose this structure it might serve. The eyes are relatively forward facing, like in most other species in the family.