Red-eyed Tree Frog (Agalychnis callidryas)

The Red-eyed Tree Frog is easily one of the best recognized frogs in Costa Rica. It is featured in most ads promoting eco-tourism activities to both nationals and foreigners. Its colors are very bright and varied, ranging from the white belly and throat, green dorsum and sides of the arms and legs, blue on the inside part of the arms and legs, the orange hands and feet, and the reddish eyes with conspicuously vertical black pupils. Like many other tree frogs, they are nocturnal and arboreal.

Red-eyed Tree Frog - Agalychnis callidryas - Rana Arbórea de Ojos Rojos
A nocturnal species of frogs, their images are commonly used to promote tourism in the tropics and particularly in Costa Rica. Indeed those eyes are enchanting when looked at from a close perspective
A Red-eyed Tree Frog clinging on the tip of a Torch Ginger flower in the rain forest. The white circles are small windows between tree branches that let sun light in. By selectively focusing on the subject and defocusing the background, such effects can be achieved easily.
Another image of the Red-eyed Tree Frog, clinging to a Torch Ginger flower, with the same defocused background effect, now in horizontal orientation.
Rain can easily be simulated during a night photoshoot using a spray bottle, as the flash will illuminate the drops as they fall. If one would want longer looking drops, then the use of a continuous source of light will do the trick.
Most tree frogs are nocturnal in nature and become more active during or after rainy evenings. It is common to hear them calling from ponds and branches, most normally males trying to attract females.
This frog can essentially look in two directions at the same time! That’s a incredible adaptation that enables them to spot potential predators and prey alike.
A Red-eyed Tree Frog clings to the branch with eyes partially covered by the nictitating membrane, which is used to cover the eyes to see underwater. Disclaimer: Taken under a controlled environment, rain simulated with a spray bottle.
A frontal image reveals how the eyes are very separated from one another, in start contrast to a predator’s front facing eyes like ours.
Those are really expanded pupils, ready for a night’s hunt. They almost cover the entire eye! I could almost call it the Black-Eyed Tree Frog.
Another shot of the Red-eyed Tree Frog with the pupils wide open. The blue arms and orange fingers on this frog are a nice touch of color, but one that potentially helps predators see them easily during the day, when they are usually resting.
At least 13 individuals are displayed at the frog exhibit in Monteverde. The best time to see these is at night, when they are the most active.
Red-eyed Tree Frog - Agalychnis callidryas - Rana Arbórea de Ojos Rojos (4)
Red-eyed Tree Frog - Agalychnis callidryas - Rana Arbórea de Ojos Rojos (3)
Red-eyed Tree Frog - Agalychnis callidryas - Rana Arbórea de Ojos Rojos (2)
Another view of this magnificent frog. The blue and yellow markings on the sides are also seen
Red-eyed Tree Frog - Agalychnis callidryas - Rana Arbórea de Ojos Rojos (5)
This frog was clinging so tight to the branch. Their feet are provided with structures to get a good grip when climbing on plants and trees
Red-eyed Tree Frog - Agalychnis callidryas - Rana Arbórea de Ojos Rojos (6)
The eyes of the Red-eyed Tree Frog are fascinating and pop with color even on the dark. The underside of the frog is white, which contrasts with the dark forest they tend to inhabit
Red-eyed Tree Frog - Agalychnis callidryas - Rana Arbórea de Ojos Rojos (7)
The iris is all covered in veins and the eye is large in comparison with the body, helping this species see very well in the dark forest

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