Phil Savoie / Reticulated glass frog (Hyalinobatrachium valerioi) La Selva Field Station, Costa Rica.

Nick Garbutt / Emerald Glass Frog (Centrolenella proseblepan) on leaf. Mid-altitude rainforest, Bosque de Paz, Pacific slope, Costa Rica, Central America.

Edwin Giesbers / Reticulated glass frog (Hyalinobatrachium valerioi) captive, occurs in Colombia, Costa Rica, Ecuador, and Panama

Pete Oxford / Portrait of an Emerald Glass Frog (Espadarana / Centrolenella prosoblepon). Captive. Choc Region of northwest Ecuador.

Doug Wechsler / Pacific giant glass frog (Centrolenella geckoideum). NW Andes (2550m), Carchi Province, Ecuador, South America

Lucas Bustamante / Reticulated glass frog (Hyalinobatrachium valerioi) viewed through hole in leaf seeing internal organs through its transparent skin, Canande, Esmeraldas, Ecuador.

Lucas Bustamante / Female Reticulated glass frog (Hyalinobatrachium valerioi) viewed from below seeing internal organs through transparent skin, Canande, Esmeraldas, Ecuador.

Lucas Bustamante / Emerald glass frog (Espadarana prosoblepon) portrait, sitting on leaf, Buenaventura Reserve, Pinas, El Oro, Ecuador.

Lucas Bustamante / Minute Glassfrog (Centrolene peristictum) male guarding eggs, Mindo, Pichincha, Ecuador, Vulnerable species.

Lucas Bustamante / Emerald glass frog (Espadarana prosoblepon) pair mating, Mindo, Pichincha, Ecuador.

Lucas Bustamante / Pichincha giant glass frog (Centrolene heloderma) pair mating, Mindo, Pichincha, Ecuador.

Phil Savoie / Nicaragua Giant Glass Frog (Espadarana prosoblepon aka Centrolene prosoblepon) La Selva Field Station, Costa Rica.