Stephen Dalton / Red eyed tree frog (Agalychnis callidryas) sitting on Bromeliad leaf, controlled conditions, from Central America

Mark Bowler / Red eyed tree frog (Agalychnis callidryas) close-up of head Captive

Mark Bowler / Red eyed tree frog (Agalychnis callidryas) showing two of its three eyelids, patterned eyelid completely closed over left eye Captive

Mark Bowler / Red eyed tree frog (Agalychnis callidryas) close-up of head Captive

Mark Bowler / Red eyed tree frog (Agalychnis callidryas) walking, digital composite Captive

Mark Bowler / Red eyed tree frog (Agalychnis callidryas) portrait Captive

Mark Bowler / Red eyed tree frog (Agalychnis callidryas) sitting

Mark Bowler / Red eyed tree frog (Agalychnis callidryas)

Mark Bowler / Red eyed tree frog (Agalychnis callidryas) walking Captive

Tim Laman / Orange / Red eyed treefrog (Litoria chloris) in the rainforest of the Atherton Tablelands, Queensland, Australia

Martin van Lokven / Red-eyed Tree Frog (Agalychnis callidryas), Laguna del Lagarto, Boca Tapada, Costa Rica

Martin van Lokven / Red-eyed Tree Frog (Agalychnis callidryas), Laguna del Lagarto, Boca Tapada, Costa Rica

Martin van Lokven / Red-eyed Tree Frog (Agalychnis callidryas), Laguna del Lagarto, Boca Tapada, Costa Rica

Martin van Lokven / Red-eyed Tree Frog (Agalychnis callidryas), Laguna del Lagarto, Boca Tapada, Costa Rica

Martin van Lokven / Red-eyed Tree Frog (Agalychnis callidryas), Selva Verde, Costa Rica

Martin van Lokven / Red-eyed Tree Frog (Agalychnis callidryas) on heliconia, Tortuguero National Park, Costa Rica

Martin van Lokven / Red-eyed Tree Frog (Agalychnis callidryas) on heliconia, Tortuguero National Park, Costa Rica

Martin van Lokven / Red-eyed Tree Frog (Agalychnis callidryas), Tortuguero National Park, Costa Rica

Martin van Lokven / Red-eyed Tree Frog (Agalychnis callidryas), Tortuguero National Park, Costa Rica

Martin van Lokven / Red-eyed Tree Frog (Agalychnis callidryas) eggs, Tortuguero National Park, Costa Rica

Piotr Naskrecki / Red-eyed Tree Frog (Agalychnis callidryas) in rainforest understory, La Selva Biological Research Station, Costa Rica

Kevin Schafer / Red-eyed Tree Frog (Agalychnis callidryas) pair, Costa Rica

Tim Laman / Red-eyed tree frog (Agalychnis callidryas) on Heliconia plant. Piedras Blancas National Park, Esquinas Rainforest Lodge, Costa Rica.

Tim Laman / Red-eyed tree frog (Agalychnis callidryas) on Heliconia plant. Piedras Blancas National Park, Esquinas Rainforest Lodge, Costa Rica.

Tim Laman / Red-eyed tree frog (Agalychnis callidryas) on Heliconia plant. Piedras Blancas National Park, Esquinas Rainforest Lodge, Costa Rica.

Tim Laman / Red-eyed tree frog (Agalychnis callidryas) on Heliconia plant. Piedras Blancas National Park, Esquinas Rainforest Lodge, Costa Rica.

Jouan & Rius / Red-eyed tree frog (Agalychnis callidryas) in rainforest, Tortuguero NP, Costa Rica

Robert Valentic / Red eyed tree frog {Litoria chloris} male perching above pond in wet season about to call for mate, Coffs Harbour, New South Wales, Australia

Tim Fitzharris / Red-eyed Tree Frog (Agalychnis callidryas), Costa Rica

Tim Fitzharris / Red-eyed Tree Frog (Agalychnis callidryas) clinging in reeds, Costa Rica

Tim Fitzharris / Red-eyed Tree Frog (Agalychnis callidryas) climbing on reeds, Costa Rica

Tim Fitzharris / Red-eyed Tree Frog (Agalychnis callidryas), Costa Rica

Kerstin Hinze / Red-eyed Treefrog (Agalychnis callidryas) on leaf, captive

Kerstin Hinze / Red-eyed Treefrog (Agalychnis callidryas) in Bromeliad flower, captive

Thomas Marent / Australian Red-eyed Treefrog (Litoria chloris) calling, Lamington National Park, Australia

Thomas Marent / Australian Red-eyed Treefrog (Litoria chloris) pair in amplexus, Lamington National Park, Australia

Edwin Giesbers / Red eyed tree frog (Agalychnis callidryas) on plant stem, Costa Rica

Edwin Giesbers / Red eyed tree frogs (Agalychnis callidryas) mating pair, Costa Rica

Edwin Giesbers / Red eyed tree frog (Agalychnis callidryas) sitting on leaf, Costa Rica

Edwin Giesbers / Red eyed tree frog (Agalychnis callidryas) in green haze, Costa Rica

Edwin Giesbers / Red eyed tree frog (Agalychnis callidryas) Costa Rica

Edwin Giesbers / Red eyed tree frog (Agalychnis callidryas) Costa Rica

Edwin Giesbers / Red eyed tree frog (Agalychnis callidryas) between leaves, Costa Rica

Jouan & Rius / Red-eyed tree frog (Agalychnis callidryas), rainforest habitat, Tortuguero NP, Costa Rica

Barry Mansell / Red eyed tree frog {Agalychnis callidryas} Central America

PREMAPHOTOS / Red-eyed tree frog (Litoria chloris) male with inflated throat sac, calling at night. Queensland, Australia

John Cancalosi / Red eyed treefrog {Agalychnis callidryas} captive, native to South America

Thomas Marent / Red-eyed Tree Frog (Agalychnis callidryas), Cahuita National Park, Costa Rica

Thomas Marent / Australian Red-eyed Treefrog (Litoria chloris) pair mating, Lamington National Park, Australia

Konrad Wothe / Red-eyed Tree Frog (Agalychnis callidryas) on leaf, Costa Rica

Christian Ziegler / Red-eyed Tree Frog (Agalychins callydrias) eggs with developing embryos inside, Soberania National Park, Panama

Christian Ziegler / Rhinoceros Spearbearer (Copiphora rhinoceros) feeding on developping eggs of the Red-Eyed Tree Frog (Agalychnis callidryas) initiation spontanious hatching behavior of the embryos, La Selva, Costa Ric...

Christian Ziegler / Rhinoceros Spearbearer (Copiphora rhinoceros) feeding on developping eggs of the Red-eyed Tree Frog (Agalychnis callidryas) initiating spontanious hatching behavior of the embryos, La Selva, Costa Ric...

Christian Ziegler / Red-eyed Tree Frog (Agalychnis callidryas) in rainforest habitat, La Selva, Costa Rica

Christian Ziegler / Red-eyed Tree Frog (Agalychnis callidryas) eye covered with nictating membrane

Christian Ziegler / Red-eyed Tree Frog (Agalychnis callidryas) on a leaf hanging over a pond in La Selva, Panama

Christian Ziegler / Red-eyed Tree Frog (Agalychnis callydrias) eggs with developing embryos beginning to drop into pond below for hatching, Soberania Natioanl Park, Panama

Christian Ziegler / Red-eyed Tree Frog (Agalychnis callidryas) detail of skin

Christian Ziegler / Red-eyed Tree Frog (Agalychnis callydrias) eggs with developing embryos beginning to drop into pond below for hatching, Soberania Natioanl Park, Panama

Christian Ziegler / Red-eyed Tree Frog (Agalychnis callidryas) sleeping on a leaf overhanging a pond in La Selva, Panama

Christian Ziegler / Foam-nest Frog (Leptodactylus sp) feeding on a Red-eyed Tree Frog (Agalychnis callidryas) at a mating pond, Soberania National Park, Panama

Christian Ziegler / Red-eyed Tree Frog (Agalychnis callidryas) on a leaf, in the daytime this species is well camouflaged when it folds all colorful parts under, Soberania National Park, Panama

Christian Ziegler / Red-eyed Tree Frog (Agalychnis callidryas) on a leaf, in the daytime this species is well camouflaged when it folds all colorful parts under, Soberania National Park, Panama

Christian Ziegler / Red-eyed Tree Frog (Agalychnis callidryas), the golden webbed skin is a nictitating membrane, part of the eye lid and enables the frog to see without giving up its camouflage

Christian Ziegler / Red-eyed Tree Frog (Agalychnis callidryas) on a leaf, in the daytime this species is well camouflaged when it folds all colorful parts under, Soberania National Park, Panama

Christian Ziegler / Wasp (Polybia sp) capturing an embrionic Red-eyed Tree Frog by cutting open the ball encasing the developing embryo, Soberania National Park, Panama

Christian Ziegler / Red-eyed Tree Frog (Agalychnis callidryas) portrait, La Selva, Costa Rica

Christian Ziegler / Red-eyed Tree Frog (Agalychnis callidryas), La Selva, Costa Rica

Christian Ziegler / Red-eyed Tree Frog (Agalychnis callidryas) portrait, Costa Rica

Christian Ziegler / Red-eyed Tree Frog (Agalychnis callidryas) eye covered with nictating membrane

Christian Ziegler / Red-eyed Tree Frog (Agalychnis callidryas) eye with retracting nictitating membrane

Piotr Naskrecki / Red-eyed Tree Frog (Agalychnis callidryas) embryos in egg sacs, a few days old, Costa Rica

Tim Fitzharris / Red-eyed Tree Frog (Agalychnis callidryas) climbing on flower, Costa Rica

Tim Fitzharris / Red-eyed Tree Frog (Agalychnis callidryas) eyeing Bee Fly (Bombyliidae), Costa Rica, *digital composite*

Christian Ziegler / Red-eyed Tree Frog (Agalychnis callidryas) close-up on branch, ranges into tropical forests of Central and South America

Christian Ziegler / Red-eyed Tree Frog (Agalychnis callidryas) egg clutches are stuck to the underside of leaves overhanging water when the tadpoles hatch they drop into the water below, Barro Colorado Island, Panama

Christian Ziegler / Red-eyed Tree Frog (Agalychnis callidryas) pair mating in amplexus, Soberania National Park, Panama

Christian Ziegler / Red-eyed Tree Frog (Agalychnis callidryas) close-up of eye, sitting on a leaf, Soberania National Park, Panama

Christian Ziegler / Red-eyed Tree Frog (Agalychnis callidryas) sitting on leaf in the mid canopy, Soberania National Park, Panama

Christian Ziegler / Red-eyed Tree Frog (Agalychnis callidryas) different aged eggs on the same leaf, one and four days old, Soberania National Park, Panama

Christian Ziegler / Parrot Snake (Leptophis ahaetulla) eating egg clutch of Red-eyed Tree Frog (Agalychnis callidryas) tadpoles hatching, Soberania National Park, Panama

Christian Ziegler / Parrot Snake (Leptophis ahaetulla) eating egg clutch of Red-eyed Tree Frog (Agalychnis callidryas) tadpoles hatching, Soberania National Park, Panama

Christian Ziegler / Parrot Snake (Leptophis ahaetulla) approaching Red-eyed Tree Frog (Agalychnis callidryas), Soberania National Park, Panama

Christian Ziegler / Red-eyed Tree Frog (Agalychnis callidryas) tadpole leaving the safety of a shallow pond, Soberania National Park, Panama

Christian Ziegler / Red-eyed Tree Frog (Agalychnis callidryas) shadow on leaf, Soberania National Park, Panama

Christian Ziegler / Red-eyed Tree Frog (Agalychnis callidryas) climbing on red bark, Soberania National Park, Panama

Christian Ziegler / Red-eyed Tree Frog (Agalychnis callidryas) series of early induced hatching, five day old egg clutch, by manual touch, Soberania National Park, Panama

Christian Ziegler / Red-eyed Tree Frog (Agalychnis callidryas) series of early induced hatching, five day old egg clutch, by manual touch, Soberania National Park, Panama

Christian Ziegler / Red-eyed Tree Frog (Agalychnis callidryas) pair in amplexus, Soberania National Park, Panama

Christian Ziegler / Cat-eyed Snake (Leptodeira septentrionalis) eating egg clutch of Red-eyed Tree Frog (Agalychnis callidryas) some tadpoles escaping through early hatching, Soberania National Park, Panama

Christian Ziegler / Red-eyed Tree Frog (Agalychnis callidryas) egg clutch under palm frond overhanging pond, Soberania National Park, Panama

Christian Ziegler / Red-eyed Tree Frog (Agalychnis callidryas) satellite male is sitting on egg laying pair to fertilize eggs, Soberania National Park, Panama

Christian Ziegler / Red-eyed Tree Frog (Agalychnis callidryas) detail of eye, Soberania National Park, Panama

Christian Ziegler / Red-eyed Tree Frog (Agalychnis callidryas) egg clutch, four days old, Soberania National Park, Panama

Christian Ziegler / Red-eyed Tree Frog (Agalychnis callidryas) backlit egg clutch, four days old, Soberania National Park, Panama