Red-Eyed Tree Frog
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40 free Red-Eyed Tree Frog trivia questions with answers — trivia quiz, new questions added Oct 2026.
The red-eyed tree frog is one of the most photographed animals on Earth, yet its looks are far from the most surprising thing about it. Its eggs can sense danger and act on it, its males argue in a way nobody noticed until scientists wired up the plants they sit on, and its famous eyes are part of a clever bluff. This quiz collects the best fun facts about the species: how it hides in plain sight and what it does when discovered, how its young grow up, what hunts it, and how researchers uncovered its secrets. Every answer comes with a short explanation, so a wrong guess still teaches you something. The questions run from easy to tricky, which suits curious kids, classrooms, and anyone who has admired this frog on a poster or a coffee bag.
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Q 01What signal tells red-eyed tree frog embryos a snake is at their clutch, so they hatch days early?
Vibrations
Vibrations from the snake's jaws are the cue, and the embryos can tell them apart from the patter of a rainstorm. Hatchlings wriggle free and drop into the water below.
Q 02The Rainforest Alliance made the red-eyed tree frog its mascot because it is common in which country?
Costa Rica
Costa Rica is where the group first worked to protect forests in the late 1980s, and the frog was a familiar sight there. Its seal now appears on coffee, tea, cocoa and bananas.
Q 03What is the gold-veined nictitating membrane that covers a sleeping red-eyed tree frog's eye?
A third eyelid
A third eyelid, see-through and laced with gold, lets the frog rest while still noticing a predator's approach. Many birds, reptiles and sharks have one too.
Q 04What does a female red-eyed tree frog look for beneath a leaf before laying her eggs on it?
A pond
A pond or large puddle sits below the chosen leaf, so the tadpoles simply slide off and splash down. Each clutch holds roughly 40 eggs.
Q 05Red-eyed tree frog tadpoles graze on algae and plankton, but what else will they sometimes eat?
Each other
Each other is on the menu, since the tadpoles turn cannibal as well as scavenging carrion. Dragonflies, meanwhile, are among the hunters that eat them.
Q 06What lets a red-eyed tree frog cling to the underside of a leaf and climb almost any surface?
Adhesive toe pads
Adhesive toe pads grip so firmly that a mating female can hang from them under a leaf while the males wrestle nearby.
Q 07What is a group of red-eyed tree frogs called, the name National Geographic lists on its fact file?
An army
An army is the collective noun, a grand title for an animal that would fit inside a teacup: even the larger females reach only about three inches.
Q 08What colour are the stripes on a red-eyed tree frog's flanks, hidden under its legs during sleep?
Blue and yellow
Blue and yellow bars line the flanks, and the sleeping frog folds its legs over them so only leaf-coloured skin shows. Females also judge a male by his stripes.
Q 09The red-eyed tree frog is native to the humid lowland forests of which region?
Central America
Central America is the frog's heartland, with a range that also spills into the north-western corner of South America. It needs humidity of 80 percent or more.
Q 10What do adult red-eyed tree frogs mainly eat, hunting among the leaves after dark?
Insects
Insects such as moths, crickets and flies make up most meals, though a big adult will now and then swallow a smaller frog.
Q 11Which process turns a red-eyed tree frog tadpole into a froglet after its spell of life in water?
Metamorphosis
Metamorphosis reshapes the swimming tadpole into a froglet, and its timing shifts with conditions in the water. Before then, a tadpole can last only up to 20 hours on land.
Q 12Wild red-eyed tree frogs are threatened by capture for which international business?
The pet trade
The pet trade takes frogs from the wild in several countries, which is why zoos urge buyers to choose captive-bred animals only.
Q 13Red-eyed tree frog eggs that fall into the water hatch early because the embryos run short of what?
Oxygen
Oxygen runs low once a clutch is submerged, and the embryos can then hatch at just three days old, about half the usual time.
Q 21Which IUCN Red List category covers the red-eyed tree frog, which copes well with altered habitat?
Least Concern
Least Concern reflects a wide range and a tolerance for disturbed forest, yet the IUCN still records many populations as shrinking.
Q 22What do red-eyed tree frog embryos release from their snouts to dissolve an exit hole in the egg?
Enzymes
Enzymes stored in cells on the snout are dumped all at once, so an escape takes seconds. Photographs showed the cells full before hatching and empty afterwards.
Q 23Which call does a male red-eyed tree frog make to attract a female when rainfall is at its highest?
Chack
Chack is how the call is written down, and females weigh it together with the stripes on a male's sides before choosing a mate.
Q 14Which red-eyed tree frog parent, if either, stays to guard the eggs once they are laid on a leaf?
Neither
Neither parent returns to the clutch, so the embryos must defend themselves, which they do by hatching in a hurry when attacked.
Q 15Which word describes the texture of a red-eyed tree frog's skin, which helps it pass for a leaf?
Smooth
Smooth skin with almost no bumps lets the resting frog pass for part of a leaf. A coat of mucus on top slows water loss and helps fight infection.
Q 16How do male red-eyed tree frogs threaten rivals before they wrestle, a signal first decoded in 2010?
Shaking their perch
Shaking their perch sends tremors along the plant to a rival, and the male that keeps it up longest usually wins. No tree-dwelling vertebrate had been shown to signal this way before.
Q 17Besides snakes, which stinging predators raid red-eyed tree frog eggs and trigger early hatching?
Wasps
Wasps raid the clutches alongside egg-eating snakes, and an embryo at one study site had a 50 percent chance of meeting one or the other.
Q 18Which stand-in rival did scientists build to pick fights with male red-eyed tree frogs?
A robot frog
A robot frog drew angry replies from real males, but only while its signals were switched on. When it sat still, they ignored it.
Q 19Which rival in the Bone Wars fossil feud first described the red-eyed tree frog, back in the 1860s?
Edward Drinker Cope
Edward Drinker Cope named the frog while still in his early twenties, years before his fossil feud with Marsh began.
Q 20What is the red-eyed tree frog's defence of suddenly flashing its eyes, feet and flanks called?
Startle coloration
Startle coloration buys the frog an instant: a bird or snake hesitates at the burst of colour, and the frog springs away.
Q 24Chytrid, a threat to red-eyed tree frogs and to frogs across the world, is which kind of organism?
A fungus
A fungus is behind the disease, which has been linked to steep declines and extinctions among frogs on several continents. No effective control is known in the wild.
Q 25Frogs like the red-eyed tree frog are sensitive to pollution, making them which kind of species?
Indicator
Indicator species show whether an ecosystem is healthy, which is why a conservation group put a frog on its seal for certified farms.
Q 26Adult red-eyed tree frogs sometimes hide inside which plants, pineapple relatives that hold water?
Bromeliads
Bromeliads trap water between their overlapping leaf bases, making damp hideaways high above the ground. One such tank was found to hold a small frog among a crowd of other creatures.
Q 27Which country hosts the Smithsonian institute where red-eyed tree frog hatching is studied?
Panama
Panama is home to the only Smithsonian bureau outside the United States, and its frog research is based in the town of Gamboa beside the canal.
Q 28What do red-eyed tree frogs produce to glue their eggs together and guard them against drying out?
Sticky jelly
Sticky jelly holds the clutch together on its leaf, and the frogs may even fold the leaf over to hide the eggs from predators.
Q 29The wild range of the red-eyed tree frog reaches its southern limit in the north of which country?
Colombia
Colombia marks the southern limit, so the species just crosses from the land bridge into a second continent. A look-alike found from Veracruz to Honduras was split off as its own species in 2019.
Q 30The leaf frog family of the red-eyed tree frog has its closest relatives in which distant land?
Australia
Australia and New Guinea hold the sister family, whose ancestors are thought to have left the leaf frogs' home continent by way of an Antarctica not yet frozen over.