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 / Misfit Leaf Frog (Agalychnis saltator) portrait in La Selva, Costa Rica

Christian Ziegler / Misfit Leaf Frog (Agalychnis saltator) portrait in La Selva, Costa Rica

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

Christian Ziegler / Misfit Leaf Frog (Agalychnis saltator) mass mating in La Selva, Costa Rica

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

Christian Ziegler / Misfit Leaf Frog (Agalychnis saltator) parachuting from the canopy to the forest floor, This behavior is thought to reduce predation risk

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 / Blue-sided Leaf Frog (Agalychnis annae) portrait, San Jose, Costa Rica

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

Christian Ziegler / Misfit Leaf Frog (Agalychnis saltator) portrait in La Selva, Costa Rica

Christian Ziegler / Misfit Leaf Frog (Agalychnis saltator), La Selva, Costa Rica

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 / Blue-sided Leaf Frog (Agalychnis annae) portrait, San Jose, Costa Rica

Christian Ziegler / Misfit Leaf Frog (Agalychnis saltator) two mating in La Selva, Costa Rica, this species only mates once or twice per year, usually after a huge rain storm at the end of the dry season

Christian Ziegler / Misfit Leaf Frog (Agalychnis saltator) mass mating in La Selva, Costa Rica

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 / Misfit Leaf Frog (Agalychnis saltator) mass mating in La Selva, Costa Rica

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 / Misfit Leaf Frog (Agalychnis saltator) mass mating in La Selva, Costa Rica

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 / Misfit Leaf Frog (Agalychnis saltator) mass mating in La Selva, Costa Rica

Christian Ziegler / Misfit Leaf Frog (Agalychnis saltator) mass mating in La Selva, Costa Rica

Christian Ziegler / Blue-sided Leaf Frog (Agalychnis annae) egg clutch, San Jose, Costa Rica

Christian Ziegler / Misfit Leaf Frog (Agalychnis saltator) massive egg aggregation in La Selva, Costa Rica

Christian Ziegler / Misfit Leaf Frog (Agalychnis saltator), La Selva, Costa Rica

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

Christian Ziegler / Misfit Leaf Frog (Agalychnis saltator) massive egg aggregation in La Selva, Costa Rica

Christian Ziegler / Misfit Leaf Frog (Agalychnis saltator) mass mating in La Selva, Costa Rica

Christian Ziegler / Misfit Leaf Frog (Agalychnis saltator) parachuting from the canopy to the forest floor, this behavior is thought to reduce predation risk

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

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

Piotr Naskrecki / Red-eyed Tree Frog (Agalychnis callidryas) ready to hatch eggs with fully developed tadpoles inside beginning to slide down the stem of the plant to which they were attached, Costa Rica

Piotr Naskrecki / Red-eyed Tree Frog (Agalychnis callidryas) semi-transparent eyelid that allows it to see its surroundings even while resting, Costa Rica

Piotr Naskrecki / Splendid Leaf Frog (Agalychnis calcarifer) rarely seen species associated with natural forest gaps, Costa Rica

Pete Oxford / Leaf frog {Agalychnis calcarifer} Esmeraldas, Ecuador

Pete Oxford / Leaf frog {Agalychnis calcarifer} Esmeraldas, Ecuador

Pete Oxford / Leaf frog {Agalychnis spurrelli} Esmeraldas, Ecuador

Pete Oxford / Leaf frog {Agalychnis spurrelli} camouflaged on leaf, Esmeraldas, Ecuador

Neil Bromhall / Spawn of Red eyed tree frog {Agalychnis callidryas} developing on leaf with tadpoles clearly visible inside, Panama

Dietmar Nill / Red eyed tree frog {Agalychnis callidryas} on leaf, Panama

David Kjaer / Red eyed tree frog {Agalychnis callidryas} captive, from Central america

David Kjaer / Red eyed tree frog {Agalychnis callidryas} captive, from Central america

Pete Oxford / Leaf frog {Agalychnis spurrelli} Esmeraldas, Ecuador

Doug Wechsler / Red eyed tree frog {Agalychnis callidryas} Costa Rica

David Kjaer / Red eye tree frog {Agalychnis callidryas} resting on leaf, Captive

David Kjaer / Red eyed tree frog {Agalychnis callidryas} head poking out behind leaf, Captive.

Fabio Liverani / Red eyed tree frogs mating {Agalychnis callidryas}, Tortuguero NP, Costa Rica

MORLEY READ / Leaf frog {Agalychnis craspedopus} Yasuni NP, Ecuador

Pete Oxford / Two Treefrogs facing one another (Agalychinis craspedopus) Ecuadorian Amazon, Ecuador, South America

David Welling / Red eyed tree frog on bromeliad {Agalychnis callidryas} USA

Dietmar Nill / Red eyed tree frog {Agalychnis callidryas} Panama, Central America

Dietmar Nill / Red eyed tree frog {Agalychnis callidryas} Panama, Central America

Phil Savoie / Rainforest tree frog on leaf (probably Cruziohyla sylviae, formerly Cruziohyla calcarifer) Costa Rica, captive

Phil Savoie / Rainforest tree frog on leaf (probably Cruziohyla sylviae, formerly Cruziohyla calcarifer) Costa Rica, captive

Pete Oxford / Leaf frog (Agalychnis craspedopus) Yasuni NP, Ecuador, South America

Pete Oxford / Treefrog (Agalychnis craspedopus) Yasuni NP, Ecuador, Ecuadorian Amazon

TIM MARTIN / Red Eyed treefrogs mating (Agalychnis callidryas) La Madra Salva, Costa Rica

Doug Wechsler / Underside of Red eyed treefrog showing suckers on feet {Agalychnis callidryas} Costa Rica

MORLEY READ / Tree frog moving along tree trunk (Agalychnis craspedopus) Ecuador

MORLEY READ / Tree frog (Agalychnis craspedopus) Ecuador

MORLEY READ / Tree frog (Agalychnis craspedopus) Ecuador

Philippe Clement / Gliding Treefrog / Spurell's flying frog {Agalychnis spurrelli} clinging on underside of leaf, Costa Rica.

Philippe Clement / Gliding Treefrog / Spurell's flying frog / Leaf frog {Agalychnis spurrelli} Costa Rica.

Philippe Clement / Barred / Splendid Leaf Frog (probably Cruziohyla sylviae, formerly Cruziohyla calcarifer) resting on palm leaf, Costa Rica.