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Frog Hollow

Situated on 3 acres of rain forest at the Lost Iguana Resort, Frog Hollow is a sanctuary for over 20 species of frogs.  We worked in corroboration with Johnny, owner of  Flow Tours; his extensive knowledge in animal ecosystems and passion for protecting wildlife guided the creation of multiple habitats specially curated for individual species. Only guided tours are allowed in Frog Hollow to preserve the delicate environment. 

Poison Dart Frog

Poison dart frogs are famous for their bright, neon colors—like blue, yellow, orange, and green. But don’t let their beauty fool you! Those vivid hues are nature’s way of saying, “Don’t eat me!” It’s called aposematic coloration, a warning to predators that they’re toxic.

Esmeralda Glass Frog

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ThThe Esmeralda glass frog (Hyalinobatrachium esmeralda) gets its name from something magical—you can actually see through its skin! The belly is translucent, revealing internal organs like the heart, liver, and even eggs in females. It’s like looking through a living window!

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Red Eyed Tree Frog

The Red-Eyed Tree Frog (Agalychnis callidryas) is one of the most recognizable amphibians in the world, thanks to its bright red eyes, vivid green body, and flashes of blue and yellow on its sides. Those shocking red eyes are a defense trick! It’s called startle coloration. When the frog is resting, its eyes are closed and its colors hidden. If a predator gets too close, the frog suddenly opens its eyes and shows its colors, hopefully giving the predator a moment of confusion—just long enough for the frog to leap away.

Reticulated Glass Frog

The Reticulated Glass Frog is one of the most visually striking species, with a net-like green and yellow pattern on its back—like living rainforest lace. Reticulated glass frogs are nocturnal and arboreal (tree-living), so they’re most active at night. With their tiny size (about 2–3 cm), they’re easy to miss—so keep your eyes peeled on leaves and branches! The males guard the eggs! Females lay eggs on leaves that hang over streams, and the males stick around to keep the eggs moist and safe from predators and fungus. Once the tadpoles hatch, they drop into the stream below to start their underwater journey.

Mask Leaf Frog

With their green backs, golden eyes, and leaf-shaped bodies, Masked Leaf Frogs are masters of disguise. During the day, they tuck into leaves and are nearly invisible. When disturbed, they sometimes reveal a flash of color on their legs—like a surprise warning!

Dusty Glass Frog

The Dusty Glass Frog is a relatively newly discovered species, formally described in 2022! Named after conservationist Dusty Meyer. This frog is small (only about 2–3 cm) with a lime green back, delicate yellow spots, and—you guessed it—a translucent belly! 

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Puma Trek is located at

Arenal, Costa Rica at

the Lost Iguana Resort & Spa.

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