91 Fun Facts About Frogs

What unique feature of glass frogs gives them their name?

Glass frogs (family Centrolenidae) get their name from the translucent skin on their underside, through which their internal organs — including the heart, liver, and intestines — are visible. Their backs are typically lime green for camouflage on leaves.

What is the process called when a tadpole transforms into a frog?

Metamorphosis is the biological process through which a tadpole undergoes dramatic physical changes — losing its tail, growing legs, and developing lungs — to become an adult frog.

How do most male frogs attract females during mating season?

Male frogs attract females mainly by calling or croaking — chirps, trills and croaks made by pushing air over the vocal cords — and each species has a distinctive call that females recognise.

In everyday usage, what most often marks an anuran out as a 'toad' rather than a 'frog'?

'Toad' is an informal label for terrestrial species with dry, warty skin, while 'frog' usually means a smooth, moist-skinned swimmer. The split is cosmetic: the smooth-skinned Panamanian golden frog is a true toad, and the warty fire-bellied toad is not.

Frogs belong to which class of animals?

Frogs are amphibians, belonging to the class Amphibia and the order Anura. Like other amphibians, they typically begin life in water as larvae (tadpoles) and undergo metamorphosis to live on land as adults.

Which species from Cameroon and Equatorial Guinea is the world's largest, weighing up to 3.3 kg?

Conraua goliath reaches about 35 cm from snout to vent, and with legs outstretched the biggest specimens exceed 80 cm. Its eyes alone can be nearly 2.5 cm across.

What do frogs primarily use their long, sticky tongues for?

Frogs use their long, sticky tongues to catch insects and other small prey. A frog's tongue can shoot out and retract in less than a tenth of a second, faster than the human eye can follow.

Which North American species can spend the winter frozen solid, with no heartbeat or breathing?

Rana sylvatica tolerates 65–70% of its body water turning to ice, packing its cells with glucose and urea as antifreeze. Alaskan wood frogs have stayed frozen for around 193 consecutive days and thawed out fine.

What fungal disease has been devastating frog populations worldwide since the late 1990s?

Chytridiomycosis, caused by the fungus Batrachochytrium dendrobatidis, attacks the keratin in amphibian skin and disrupts water and electrolyte balance. Genome studies point to a lineage from the Korean peninsula as the likely seed of the global outbreak.

Which country imported 102 cane toads from Hawaii in 1935 to eat sugar-cane beetles, with disastrous results?

Australia's toads largely ignored the grey-backed cane beetle they were hired to eat, and by 2011 were estimated at more than 200 million.

How do frogs drink water?

The permeable skin does the work, especially a patch on the belly and thighs; the same leakiness means they lose water too.

What is a group of frogs called?

A group of frogs is an army; a group of toads is a knot. Both terms are recorded by the US Geological Survey's list of animal group names.

What is the scientific order name for frogs and toads?

Anura (meaning 'tailless' in Greek) is the order that includes all frogs and toads. Caudata is the order for salamanders, Gymnophiona for caecilians, and Squamata for lizards and snakes.

Approximately how many known species of frogs exist worldwide?

There are over 7,000 known species of frogs, making them one of the most diverse groups of vertebrates. New species are still being discovered regularly, particularly in tropical rainforests.

Which Papua New Guinea species was announced in 2012 as the world's smallest vertebrate?

At 7.7 mm from snout to vent, Paedophryne amauensis was hailed as the tiniest vertebrate on Earth in 2012. Its title has since been challenged by the Brazilian flea toad, measured even smaller in 2024.

What special adaptation allows tree frogs to climb smooth vertical surfaces?

Tree frogs have specialized toe pads that use wet adhesion — a thin layer of mucus between the pad and the surface creates capillary forces, allowing them to cling to smooth surfaces like glass. The pads also have microscopic channels that maintain grip in wet conditions.

Which Colombian species is considered the most poisonous animal on the planet?

The golden poison frog (Phyllobates terribilis) of Colombia's Pacific lowlands carries about one milligram of batrachotoxin in its skin, enough to kill 10 to 20 humans.

What happens to a tadpole's tail during metamorphosis?

It is reabsorbed by the body through apoptosis, programmed cell death, and the recycled nutrients help fuel the new legs.

What is the term for a frog's egg mass laid in water?

Frogspawn refers to the jelly-like mass of eggs that frogs lay in water. Each egg is surrounded by a protective layer of clear jelly. A single female frog can lay thousands of eggs at once, though the vast majority will not survive to adulthood.

Because of their permeable skin and two-habitat life, scientists treat frogs as what?

Trouble in either habitat shows up in frogs early, which is why they are called bioindicators of ecosystem health, a natural early-warning system for pollution.

When a frog fires its tongue at prey, what is it mainly reacting to?

A frog's distance vision beats its near vision, so it lines up a small moving target and then shuts its eyes as the tongue shoots out. Despite the old myth, frogs do see in colour, even in very low light.

What is the inflatable sac on a male frog's throat used for?

The vocal sac on a male frog's throat acts as a resonating chamber to amplify mating calls. When the frog calls, air is pumped from the lungs over the vocal cords and into the sac, which inflates like a balloon and projects the sound over longer distances.

How does the male Darwin's frog look after his young?

The male Darwin's frog (Rhinoderma darwinii) from Chile scoops up developing eggs and carries them in his vocal sac, where the tadpoles complete their development. Once they metamorphose into tiny froglets, he opens his mouth and they hop out.

Which continent has no native frog species?

Antarctica is the only continent with no native frog species. Frogs are found on every other continent, though they are most diverse in tropical regions. The extreme cold and lack of freshwater habitats make Antarctica inhospitable for amphibians.

Why do many frogs have brightly colored skin?

Bright colours in frogs are usually aposematism, a warning that the wearer is toxic or foul-tasting. Camouflaged species go the other way, with dappled browns and greens and warty skin folds that break up their outline.

Which branch of zoology covers frogs and the rest of the amphibians, plus reptiles?

Herpetology is the branch of zoology that studies amphibians and reptiles. The name comes from the Greek word 'herpeton' meaning 'creeping animal.' Scientists who study frogs are called herpetologists.

In which classic video game does the player help a frog cross a busy road and river?

Frogger, released by Konami in 1981, is an arcade classic where players guide a frog across a busy highway and a river filled with hazards. It became one of the most recognizable games of the early arcade era.

What is the primary way frogs breathe as adults?

Adult frogs breathe through both lungs and skin: the thin, moist, permeable skin lets oxygen pass straight into the bloodstream, and a frog overwintering underwater relies on its skin alone.

Which Madagascan species puffs itself up and oozes a sticky white gum when threatened?

The tomato frog (Dyscophus antongilii) is endemic to Madagascar and gets its name from its round body shape and bright reddish-orange color. When threatened, it puffs up its body and secretes a thick, sticky white substance from its skin.

What do tadpoles primarily eat before they become frogs?

Most tadpoles are herbivorous, feeding primarily on algae and aquatic plant matter. They have specialized mouthparts for scraping algae from rocks and plants. As they metamorphose, their diet shifts to insects and other animal prey.

The African clawed frog (Xenopus laevis) was historically used for what unexpected purpose?

From the 1930s to 1960s, African clawed frogs were widely used as pregnancy tests. When injected with a pregnant woman's urine (containing the hormone hCG), the frog would ovulate and produce eggs within 8-12 hours, confirming the pregnancy.

What is 'amplexus' in frog reproduction?

Amplexus is the mating position in which a male frog grasps a female from behind, clasping her body with his front legs. This grip stimulates the female to release eggs, which the male then fertilizes externally as they emerge.

In an American bullfrog, an eardrum noticeably larger than the eye tells you what?

Male bullfrogs have tympani bigger than their eyes; in females eye and eardrum are about the same size. The eardrum's size and spacing are also tuned to the frequency of the species' call.

Which amphibian, presumed extinct for over 50 years, was found alive in Israel in 2011?

The Hula painted frog (Latonia nigriventer) was last recorded in 1955 after Lake Hula was drained and in 1996 became the first amphibian the IUCN declared extinct; a ranger found one alive at the Hula Nature Reserve in 2011.

Which extinct Australian species swallowed its fertilised eggs and raised the young inside its stomach?

Female gastric-brooding frogs (Rheobatrachus) shut down stomach acid and brooded tadpoles in the stomach, giving birth through the mouth; both Queensland species vanished in the mid-1980s and are considered extinct.

Which hormone is responsible for triggering metamorphosis in tadpoles?

Thyroid hormones, particularly thyroxine (T4), are the primary trigger for metamorphosis in tadpoles. Rising levels of thyroxine stimulate the dramatic changes including tail resorption, leg growth, lung development, and the switch from herbivorous to carnivorous diet.

Captive-bred dendrobatid frogs are harmless because their skin toxins come from where?

The frogs sequester alkaloids from the arthropods they eat rather than making them. Raised on ordinary feeder insects, even the deadly Phyllobates species gradually lose their toxicity.

What does 'crucifer' in the spring peeper's scientific name, Pseudacris crucifer, refer to?

Crucifer means 'cross-bearing', for the X-shaped pattern on the peeper's back. Its common name comes from the chirping chorus that marks the start of spring across the eastern US and Canada.

What adaptation allows the Surinam toad to carry its developing young?

The Surinam toad (Pipa pipa) has one of the most unusual reproductive methods in the animal kingdom. During mating, eggs are pressed into the spongy skin of the female's back, where the skin grows over them. The young develop completely within these skin pockets and emerge as fully formed froglets.

In 2023, what share of amphibian species were assessed as threatened with extinction?

The 2023 Global Amphibian Assessment found roughly 40% of amphibian species threatened with extinction, the highest of any vertebrate class. Habitat loss, climate change, pollution and chytrid fungus are the main drivers.

Which Ecuadorian species can switch its skin from spiny to nearly smooth within minutes?

Nicknamed the punk rocker frog, Pristimantis mutabilis was first spotted in 2006 but its shape-shifting only came to light when a specimen was collected in 2009; it was formally described in 2015. How it does it is still unknown.

Which North American species, a resident of cold mountain streams, makes no calls at all?

Ascaphus truei lives in rushing streams where a call would be drowned out, so it has none. Its 'tail' is actually an extension of the male's cloaca used for internal fertilisation, unique among frogs.

The big-mouthed Argentine horned frog is nicknamed after which arcade character?

Ceratophrys ornata is nicknamed the pacman frog after Pac-Man: its mouth spans most of its body, and females reach about 16.5 cm from snout to vent.

Besides calling, how does the Panamanian golden frog signal to rivals and mates?

Panama celebrates National Golden Frog Day on 14 August, though the species may have been extinct in the wild since 2007.

How does Central Africa's hairy frog produce its retractable 'claws'?

The hairy frog (Trichobatrachus robustus) makes its 'claws' by breaking its own toe bones; the sharp bone fragments pierce through the toe pads when the frog is threatened.

The pig-nosed purple frog, formally described in 2003, lives in which mountain range?

The purple frog (Nasikabatrachus sahyadrensis) burrows in the Western Ghats of southern India, surfacing only briefly each monsoon to breed; its tadpole had been described long before the adult was named in 2003.

The baggy-skinned Titicaca water frog is jokingly nicknamed after which body part?

Telmatobius culeus is nicknamed the 'scrotum frog' for its baggy skin folds, which boost oxygen uptake in the cold, high-altitude Lake Titicaca shared by Bolivia and Peru.

What sound does the desert rain frog of Namibia make when threatened?

A viral video of its toy-like squeak made the plump burrower an internet celebrity.

Which species is North America's largest tree frog?

The Cuban tree frog (Osteopilus septentrionalis) grows to about 14 cm, making it the largest tree frog in North America; native to Cuba, the Bahamas and the Cayman Islands, it is invasive across Florida.

The coquí, named for its two-note night call, is native to which island?

The common coquí (Eleutherodactylus coqui) is Puerto Rico's unofficial symbol; the 'co' note warns off rival males, the 'quí' attracts females, and the species skips the tadpole stage entirely.

What is the 'mountain chicken' of Dominica and Montserrat?

The mountain chicken (Leptodactylus fallax) is a large edible frog, one of the Caribbean's biggest, hunted for its chicken-like meat; chytrid outbreaks left it critically endangered.

How does the male midwife toad earn its name?

He keeps the strings of eggs on his back and thighs until they are ready to hatch.

What does the male African bullfrog occasionally do while guarding his tadpoles?

The father will dig channels to free trapped tadpoles, but he is also a confirmed cannibal.

Which country is the world's largest exporter of frog meat?

Indonesia is the world's leading exporter of frog legs, shipping thousands of tonnes a year mainly to France, Belgium and Luxembourg, where the dish is traditional.

Who wrote and illustrated the Frog and Toad easy-reader books?

Lobel said Frog and Toad were really two aspects of himself.

In Mark Twain's 1865 story, Jim Smiley names his jumping frog after which statesman?

Dan'l Webster loses the bet after a stranger secretly fills him with quail shot.

Disney's The Princess and the Frog (2009) is set in which city?

New Orleans gives the film its jazz and its bayou: Tiana dreams of opening a restaurant there until a kiss with frog-prince Naveen turns her into a frog too.

In the Book of Exodus, frogs swarming out of the Nile were which of the ten plagues?

Frogs were the second plague: they followed the Nile turning to blood and preceded the plague of lice or gnats (Exodus 8).

In Aristophanes' comedy The Frogs, which god travels to the underworld?

Dionysus, god of theatre, descends to the underworld to bring back Euripides, then ends up judging a contest between Euripides and Aeschylus for the throne of tragedy.

Heqet, depicted as a frog, was the ancient Egyptian goddess of what?

Heqet was the frog-headed goddess of fertility and childbirth: frogs appeared in their millions with the annual Nile flood, so Egyptians tied them to abundance and new life.

How many legs does the Chinese money toad, Jin Chan, traditionally have?

Jin Chan, the three-legged money toad, sits on a pile of cash with a coin in its mouth and is linked to the Daoist immortal Liu Haichan.

Which cartoonist created Pepe the Frog in the 2005 webcomic Boy's Club?

Matt Furie created Pepe the Frog in his 2005 comic Boy's Club, where the catchphrase 'Feels Good Man' first appeared; Furie later fought the character's co-option as a hate symbol.

The Crazy Frog's chart-topping 2005 single was a cover of the theme from which film?

'Axel F' is Harold Faltermeyer's theme from Beverly Hills Cop (1984); Crazy Frog's version debuted at number one in the UK in 2005 and stayed there for four weeks.

In 1780, Luigi Galvani noticed that a dead frog's legs did what when struck by a spark?

Galvani's dead frog legs twitched when touched by a spark or by two different metals; the observation launched the study of 'animal electricity' and a famous feud with Alessandro Volta.

Central America's túngara frog lays its eggs in what kind of structure?

The male whips a foam-producing fluid from the female into a raft that shields the eggs.

The painkilling alkaloid epibatidine was first isolated from a frog from which country?

John Daly isolated epibatidine in 1974 from the skin of Epipedobates anthonyi, a poison frog from Ecuador, but its structure was not worked out until 1992.

Mantella frogs, the Old World lookalikes of South America's poison frogs, are found only on which large island?

Madagascar's mantellas evolved the same warning colours as the unrelated Dendrobatidae, a textbook case of convergent evolution.

In Matsuo Bashō's most famous haiku, a frog jumps into what?

Bashō's 1686 verse runs 'old pond / a frog jumps in / the sound of water'; Edo poets later held a whole haikai contest on frogs in tribute to it.

What happens when a dormant Outback frog, Cyclorana platycephala, is gently squeezed?

During dormancy it lines its burrow with a watertight mucus cocoon made from shed skin.

Which TV network used Michigan J. Frog as its mascot from 1995 to 2005?

The WB adopted Michigan J. Frog, the top-hatted star of Chuck Jones's 1955 short One Froggy Evening, as its mascot at launch in 1995 and retired him in 2005.

In The Wind in the Willows, Mr. Toad becomes obsessed with what?

Motor cars hooked Toad after one ran his caravan off the road; Grahame may have had in mind Colonel Francis Ricardo, the first car owner in Cookham, where he wrote the book.

Which ex-Beatle recorded the 1984 hit 'We All Stand Together' with the Frog Chorus?

Paul McCartney wrote and recorded 'We All Stand Together' for his animated short Rupert and the Frog Song; it peaked at No. 3 in the UK in 1984.

In the game Chrono Trigger, the party member Frog was originally what?

A squire named Glenn: Magus cursed him into frog form after killing his friend Cyrus, leaving him sworn to protect Queen Leene.

In Super Mario Bros. 3, what does the Frog Suit mainly improve?

It also boosts jump height on land, at the cost of awkward hopping movement.

The three Battletoads heroes are named after what?

Rash, Zitz and Pimple are named after skin conditions — a rash, a zit and a pimple; Rare created the trio in 1991 to rival the Teenage Mutant Ninja Turtles games.

Sitting alone on a log in the swamp, Kermit opens The Muppet Movie singing 'Rainbow Connection' on which instrument?

The banjo became Kermit's signature; Paul Williams and Kenneth Ascher's song earned an Oscar nomination and entered the National Recording Registry in 2020.

Three Dog Night's 1971 hit 'Joy to the World' opens by naming a bullfrog; what Old Testament name does it get?

Jeremiah was a bullfrog only because Hoyt Axton needed placeholder nonsense to pitch the melody; Three Dog Night took it to the top of the charts.

Guenther's marsupial frog is the only known frog with what feature?

Gastrotheca guentheri is the only known frog with true teeth in its lower jaw, re-evolved after frogs lost them some 200 million years ago; marsupial frogs are named for the female's back pouch.

Which state adopted the American green tree frog as a symbol in 2005, after Louisiana?

Georgia named the American green tree frog its state amphibian in 2005, twelve years after Louisiana; the bright green climber ranges across the south-eastern coastal plain from the Carolinas to Texas.

Which species is often called the only poisonous frog native to the United States?

The pickerel frog's skin secretions can kill other frogs kept in the same bucket, as many novice collectors discover.

Which frog, native to the hills around Hollywood, gave movie frogs worldwide their 'ribbit'?

The Pacific tree frog lives within earshot of Hollywood, which is why movie frogs the world over say 'ribbit' even where no local frog does.

In 2019, scientists found that pumpkin toadlets glow under UV light because of what?

Pumpkin toadlets (Brachycephalus) have fluorescent skeletons: bony plates on the back and skull glow through thin skin under UV light, a 2019 finding; the tiny Brazilian frogs hatch directly as toadlets.

Why is South America's Pseudis paradoxa called the 'shrinking frog'?

The world's longest tadpole, up to 27 cm, turns into a frog about a quarter of that length.

The Kihansi spray toad lived only in the mist zone of a waterfall in which country?

The Kihansi spray toad lived in about two hectares of waterfall spray in Tanzania's Kihansi Gorge; a dam dried the mist, the species was declared extinct in the wild in 2009, and captive-bred toads were reintroduced from 2012.

In what year was Costa Rica's golden toad last seen, before being declared extinct?

A single male golden toad was spotted on 15 May 1989 near Monteverde, Costa Rica; the last breeding had been observed in 1987, and none has been seen since.

Toughie, the last known Rabbs' fringe-limbed treefrog, died in 2016 at which institution?

Toughie lived at the Atlanta Botanical Garden, which had rescued a handful of Rabbs' fringe-limbed treefrogs from chytrid-hit Panama; the last known female died there in 2009, and the species is considered extinct.

Gardiner's Seychelles frog, which lacks a middle ear, hears using which body part?

Sechellophryne gardineri, at most 11 mm long, has no middle ear; a 2013 study showed its mouth cavity resonates with sound and passes it through thin bone to the inner ear.

The Bornean flat-headed frog was long believed to be the only frog lacking what?

Micro CT scans later found it does have lungs, just tiny ones.

Freddo the chocolate frog was invented in 1930 by an 18-year-old employee of which Melbourne confectioner, later bought by Cadbury?

A teenager called Harry Melbourne drew the frog for MacRobertson's, which Cadbury swallowed in 1967, Freddo included.

The North American mink frog is named for its smell, which many people compare to what?

Its scent is said to resemble a mink, but most people notice the onion note first.

In English, 'frog' became a derogatory nickname for people of which nationality, thanks to a famous dish?

The French got it from cuisses de grenouille, frog legs, the dish English speakers most associate with French cooking.