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Amphibian fun facts
141 genuinely delightful things about the amphibians we cover — from an axolotl that can regrow its own brain to a newt that pushes its ribs through its skin as spines. Because this is Bognook, every fact is checked against a named source and the old-wives' myths (no, toads don't give you warts) are left out — real wonder, no nonsense.
Jump to a critter, or just scroll and enjoy.
Axolotl
- The axolotl can regrow entire lost limbs, and even parts of its gills, eyes and brain, making it one of nature's most remarkable healers. Animal Diversity Web
- Unlike most salamanders, the axolotl stays in its larval form for life, keeping its feathery external gills and finned tail even as a fully grown adult. Animal Diversity Web
- In the wild the axolotl survives only in the lake and canal system of Xochimilco near Mexico City, and it is now assessed as critically endangered. Wikipedia
White's Tree Frog
- White's tree frog was the very first Australian frog to be scientifically described, back in 1790. Wikipedia
- Its Latin name caerulea means blue, because the first specimens sent to England had their yellow pigment destroyed by preservative and arrived looking blue instead of green. Wikipedia
- Its green colour actually comes from blue and green layers under a yellow filter, so removing the yellow reveals a blue frog underneath. Wikipedia
Red-Eyed Tree Frog
- When startled, the red-eyed tree frog suddenly flashes its bright red eyes and colourful sides, a burst of flash colouration meant to briefly confuse a predator and buy time to leap away. Wikipedia
- Its unhatched embryos can sense an approaching predator and hatch early, dropping straight into the water below to escape. Wikipedia
- Despite its dazzling colours the red-eyed tree frog is not poisonous, and its green body helps it hide against leaves until it needs to startle an attacker. Wikipedia
American Green Tree Frog
- The American green tree frog often gathers around porch lights and windows to snap up the insects drawn to the glow. Wikipedia
- It can shift its colour in response to its background and temperature, ranging from bright green to a reddish-brown. Wikipedia
- Rival males will eavesdrop on each other's calls, sometimes falling silent to sneak in and intercept an approaching female. Wikipedia
Gray Tree Frog
- The gray tree frog survives winter by freezing solid, using glycerol in its blood as a natural antifreeze while about 80 percent of its body turns to ice. Animal Diversity Web
- While frozen in hibernation its eyes turn opaque and its breathing and heartbeat temporarily stop, then start again when it thaws in spring. Animal Diversity Web
- True to its scientific name versicolor, the gray tree frog can change colour from nearly black to nearly white to match its surroundings. Wikipedia
Amazon Milk Frog
- The Amazon milk frog gets its name from the sticky, milk-like fluid it oozes from its skin when it feels threatened. Wikipedia
- It is one of the larger tree frogs, growing up to about 10 centimetres long. Wikipedia
- This high-canopy Amazon frog was first discovered along the Maracana River in Brazil. Wikipedia
Waxy Monkey Tree Frog
- The waxy monkey tree frog wipes a waxy secretion all over its body with its legs, coating itself in a waterproof layer that lets it bask in the dry, sunny air. Wikipedia
- To save water in its arid home, it excretes waste as uric acid, much like a bird or reptile, rather than as watery urine. Wikipedia
- During the day it rests on a perch and enters a state of torpor, which helps cut the water it loses through breathing. Wikipedia
Vietnamese Mossy Frog
- The Vietnamese mossy frog gets its name from its mottled green-and-brown skin, which looks so much like a clump of real moss that it can vanish against a mossy rock. Wikipedia
- When this frog feels frightened, it will curl its body up into a little ball and play dead until the danger passes. Wikipedia
Tiger-Leg Monkey Frog
Clown Tree Frog
- This little Amazon frog earned the nickname clown treefrog for its bold, striking markings. Wikipedia
White-Lipped Tree Frog
- The white-lipped tree frog is the world's largest tree frog, and it wears a bright white stripe along its lower lip that runs all the way back to its shoulder. Wikipedia
Dyeing Poison Dart Frog
- This frog's odd name comes from a legend that Amazonian tribes used its secretions to change the colour of green parrot feathers. Wikipedia
- It is one of the most variably coloured of all poison dart frogs, with more than 30 recognised colour patterns, each unique to its own patch of forest. Wikipedia
- These frogs do not make their own poison; they borrow it from the tiny ants and mites they eat in the wild. Wikipedia
Blue Poison Dart Frog (Azureus)
- The dazzling blue azureus frog is now classed not as its own species but as a striking blue colour morph of the dyeing poison dart frog from southern Suriname. Wikipedia
Green-and-Black Poison Dart Frog
- A population of this frog lives in Hawaii, where it was deliberately released on the island of Oahu in 1932 in the hope it would eat mosquitoes. Wikipedia
- The father frog carries his tadpoles piggyback up into the trees, where they cling to the mucus on his back until he deposits them in tiny pools of water. Wikipedia
- Like all dart frogs, it is not born poisonous but gathers its toxins from a wild diet of ants and mites. Wikipedia
Bumblebee Poison Dart Frog
- It is the only poison dart frog known to estivate, tucking itself away under rocks and fallen logs to wait out the dry season. Wikipedia
- Its bold yellow-and-black banding is aposematic colouration, a bright warning sign that tells hungry predators this little frog would make a very unpleasant meal. Wikipedia
Golden Poison Frog
- Despite its small size, this frog is considered the most poisonous living animal species on the planet. Wikipedia
- Its skin carries batrachotoxin, an extraordinarily rare poison found in only a few frog species on Earth. Wikipedia
- Native Colombians once used the frog's potent skin toxin to tip their blowgun darts. Wikipedia
Mimic Poison Dart Frog
- It is a genuine mimic, wearing at least four different colour patterns that each copy the look of a separate toxic frog species living nearby. Wikipedia
- It was the first amphibian ever shown to be monogamous, with mated pairs raising their young together. Wikipedia
- Both parents pitch in to raise the tadpoles, and the mother tops up each one with nourishing unfertilized eggs as it grows. Wikipedia
Strawberry Poison Dart Frog
Phantasmal Poison Dart Frog
Golden Mantella
- This tiny orange frog, measuring only about 20 to 26 millimetres, lives nowhere on Earth except a few small areas of Madagascar. Wikipedia
- It is one of Madagascar's most threatened frogs because of its extremely restricted range. Wikipedia
- Though it evolved an ocean apart, it independently developed the same bright warning colours and toxic skin as the poison dart frogs of the Americas. Wikipedia
Pacman Frog
- Its enormous mouth accounts for roughly half of the entire animal's size. Wikipedia
- A voracious ambush eater, it will try to swallow just about anything that moves close to that wide mouth. Wikipedia
- Along its jaws it has tooth-like odontoid projections and a fearless streak, sometimes even jumping toward a much larger attacker. Wikipedia
African Bullfrog
- The father African bullfrog is a devoted bodyguard who will even dig a channel with his head and legs to drain water toward his tadpoles when their pool starts to dry out. Wikipedia
- To survive the dry season it burrows underground and wraps itself in a cocoon that seals in moisture, then simply crawls out once the rains soften it away. Wikipedia
- One of the largest frogs on Earth, a pet African bullfrog can live for around 35 years in captivity. Wikipedia
African Dwarf Frog
- African dwarf frogs are completely aquatic yet must swim up to gulp air at the surface, because they breathe with lungs rather than through gills. Wikipedia
- This little frog has no tongue and no eyelids, and it uses the claws on its hind feet as part of its unusual toolkit. Wikipedia
- A breeding male grows a telltale white spot near his armpit, a special gland that swells up during the breeding season. Wikipedia
African Clawed Frog
- For decades the African clawed frog was a living pregnancy test: injected with a woman's urine, it would lay eggs within hours if she was pregnant. Wikipedia
- The first vertebrate ever cloned was an African clawed frog, back in 1962, in work that later earned a Nobel Prize. Wikipedia
- Four African clawed frogs flew aboard the Space Shuttle Endeavour in 1992 so scientists could see whether frogs could reproduce and develop normally in zero gravity. Wikipedia
Fire-Bellied Toad
- When frightened, a fire-bellied toad flips into the famous unken reflex, arching its head and limbs upward to flash the bright orange-red warning colours of its belly. Wikipedia
- Its vivid underside is honest advertising: the skin can ooze a milky, mildly toxic substance that tells predators to stay away. Wikipedia
- Despite the name, it is not a true toad at all, just a frog whose bumpy skin gives it a toadlike look. Wikipedia
Tomato Frog
- A threatened tomato frog puffs its body up like a balloon to look too big to swallow. Wikipedia
- If a predator does grab one, its skin oozes a thick sticky substance that gums up and numbs the attacker's eyes and mouth until it lets go. Wikipedia
- The females are the show-stoppers, growing far larger than the yellowish males and glowing a striking red-orange. Wikipedia
Budgett's Frog
- When it feels cornered, Budgett's frog puffs itself up and lets out a shrill screech, and will bite if the bluff does not work. Wikipedia
- Its comically flat, wide face is mostly mouth, with a head that makes up about a third of the whole body. Wikipedia
- To ride out the harsh dry winter it sits underground wrapped in a cocoon of its own shed dead skin, which keeps it from drying out until the rains return. Wikipedia
Asian Painted Frog
- When threatened, the Asian painted frog puffs its stocky body up like a balloon — and it can ooze a very sticky secretion that most likely helps deter predators. AmphibiaWeb
- Nicknamed the chubby frog, it digs itself underground hind-legs-first and waits out dry spells until heavy rain calls it back to the surface. Wikipedia
- This narrow-mouthed frog dines mainly on ants and termites, and has even been seen climbing trees to hunt them. Wikipedia
Surinam Toad
- The Surinam toad is almost completely flat, with a broad triangular head and no tongue, so it looks just like a dead leaf drifting in murky water. Wikipedia
- A mother Surinam toad carries her eggs in a honeycomb of pockets that grows over them in the skin of her back, and after 12 to 20 weeks fully formed little toads push their way out. San Diego Zoo
- Instead of croaking, males make sound underwater by snapping a bone in their throat, part of a courtship where the pair loops through the water in slow arcs while joined together. Wikipedia
American Toad
European Common Toad
- Common toads that were carried away and fitted with trackers still found their way back to their chosen breeding pond even from more than three kilometres away. Wikipedia
- Rather than fighting over mates, male common toads can settle disputes by the pitch of their croak, since a deeper voice reliably signals a bigger toad. Wikipedia
- The common toad has been linked with witchcraft in popular culture and literature for a very long time. Wikipedia
Cane Toad
- The cane toad is the world's largest true toad, and the biggest one on record measured about 24 centimetres from snout to vent. Wikipedia
- Cane toads were released into Queensland's sugarcane fields in 1935 to eat cane beetles, but they largely failed at the job and instead spread explosively across Australia. Wikipedia
- The cane toad's name comes from the cane beetle it was meant to control, and its poison glands make its skin dangerously toxic to many animals that try to eat it. Wikipedia
Colorado River Toad
- The Colorado River toad is the largest toad native to the United States, second in size only to the non-native cane toad. Wikipedia
- The secretion from the Colorado River toad's glands contains potent psychoactive compounds, and it is the only toad that carries enough bufotenin to have such an effect. Wikipedia
- Behind each golden eye sits a bulging kidney-shaped parotoid gland, one of several whose secretions can be potent enough to sicken a grown dog that bites the toad. Wikipedia
Green Toad
- The green toad is bright green with black spots that often fuse together into net-like stripes across its body. Animal Diversity Web
- The green toad has a flat, wedge-shaped head, and during the dry season it shelters underground in mesquite shrubs or tucks itself under rocks. Animal Diversity Web
- Green toads spend much of their lives hidden away and emerge to breed only after heavy rainfall, gathering at temporary pools and even roadside ditches. Animal Diversity Web
Tiger Salamander
- The tiger salamander is one of the largest land salamanders in North America and ranges more widely across the continent than any other salamander species. Wikipedia
- Some tiger salamanders never fully grow up: in well-suited water they keep their gills and stay aquatic for life, a condition called neoteny like their axolotl relatives. Wikipedia
- Tiger salamanders are secretive burrowers that spend most of their lives underground, using specialised foot pads to dig through loose soil. Wikipedia
Fire Salamander
- The fire salamander's bold yellow-and-black pattern is a warning sign, honestly advertising to predators that it is toxic. Wikipedia
- One fire salamander lived for more than 50 years at a German natural history museum, a remarkably long life for an amphibian. Wikipedia
- Fire salamanders don't lay eggs: most mothers give birth to larvae in water, and a couple of subspecies give birth to fully formed young that skip the water stage entirely. Wikipedia
Spotted Salamander
- The spotted salamander is the only known vertebrate whose cells host a living algae partner, with the alga found growing in and around its embryos. Wikipedia
- It is the official state amphibian of both Ohio and South Carolina. Wikipedia
- Spotted salamanders spend most of their lives hidden underground and usually only surface after rain. Wikipedia
Marbled Salamander
- Unlike most salamanders, the marbled salamander lays its eggs on land, and the mother often curls around the nest until autumn rains flood it. Wikipedia
- The marbled salamander glows, showing green biofluorescence along the bones of its toes when lit with ultraviolet light. Wikipedia
- It is the official state salamander of North Carolina. Wikipedia
Tiger Salamander (Aquatic/Neotenic)
- The tiger salamander is one of the largest land salamanders in North America and has the widest range of any salamander on the continent. Wikipedia
- In water that suits them, some tiger salamanders never grow up, keeping their gills and staying aquatic for life instead of transforming. Wikipedia
- Tiger salamanders give off a bright yellow-green glow when lit with blue or ultraviolet light. Wikipedia
Mudpuppy
- The mudpuppy keeps its feathery red external gills for its entire life, never trading them in the way most salamanders do. Wikipedia
- The common mudpuppy has the largest range of any fully aquatic salamander in North America. Wikipedia
- A mother mudpuppy guards her eggs beneath a rock at least until they hatch. Wikipedia
Siren
- Sirens have long eel-like bodies with only a tiny pair of front legs, so small they can be tucked away and hidden inside the gills. Wikipedia
- To survive a drought, a siren can burrow into the mud and seal itself inside a cocoon made of its own dead skin cells, waiting there for years if needed. Wikipedia
- Sirens keep their external gills their whole lives, never fully growing out of their larval form. Wikipedia
Amphiuma
- The amphiuma has legs, but they are so tiny and vestigial that it is often mistaken for an eel or a snake. Wikipedia
- The amphiuma carries one of the largest amounts of DNA of any living creature, roughly 25 times more than a human. Wikipedia
- The two-toed amphiuma is the longest salamander species in the United States. Wikipedia
Chinese Fire-Bellied Newt
- Despite being one of the smallest newts kept by hobbyists, this little black newt carries a bright-orange belly as a built-in warning that says do not eat me to anything that gets too close. Wikipedia
- The vivid orange underside is no bluff: the newt's skin can carry tetrodotoxin, the same family of potent toxin found in pufferfish, which makes it genuinely unpleasant to bite. Wikipedia
- When this newt settles in for winter it clusters melanin cells in its own liver, which quietly darkens its skin as it hibernates. Wikipedia
Spanish Ribbed Newt
- When truly cornered, this newt does something astonishing: it pushes its own sharp ribs outward through orange warty spots on its sides, turning its skeleton into a set of stinging spines. Wikipedia
- At the very moment its ribs push out, the newt oozes a milky poison across its skin, so the emerging ribs come coated in toxin, and its skin heals over afterward without infection. Wikipedia
- This is a genuine astronaut among amphibians: it first flew aboard the Bion 7 spacecraft in 1985 and has since been studied in space on several missions, including trips to the Mir space station. Wikipedia
Japanese Fire-Bellied Newt
- When threatened, this newt arches up and flashes its bright red belly at the attacker, a warning display that works especially well against birds, which can clearly see the colour red. Wikipedia
- This newt is a famous laboratory marvel for regeneration, and can even regrow a missing eye lens as an adult just as capably as it can as a larva. Wikipedia
- The bold red belly is backed up by real chemistry: wild individuals carry high levels of tetrodotoxin, a neurotoxin they build up mainly from what they eat. Wikipedia
Paddletail Newt
- This newt is named for its flat, broad, paddle-shaped tail, and it actually talks with it, fanning the tail to get another newt's attention or when it is startled. Wikipedia
- Its skin is remarkably smooth and slippery, kept coated in a layer of mucus that sets it apart from the warty look of many other newts. Wikipedia
- This is a newt found in the wild only in China, making it one of the country's endemic amphibians. Wikipedia
Eastern Newt
- This newt lives a striking triple life, hatching as an aquatic larva, then becoming a bright orange land-wandering juvenile called a red eft, before finally returning to the water as a greenish adult. Wikipedia
- During its red eft stage the young newt can roam the forest floor on land for two or three years, travelling far between ponds before it settles back into the water. Wikipedia
- That glowing orange colour of the red eft is honest advertising: its tissues are saturated with tetrodotoxin, the same potent toxin found in pufferfish. Wikipedia
Alpine Newt
- In the breeding season the male turns a vivid dark blue along his back and sides, set off by a bright orange belly, making him one of the most colourful newts in Europe. Wikipedia
- Some alpine newt populations never fully grow up, staying in the water as paedomorphic adults that keep their larval gills while still breeding. Wikipedia
- The male courts a female with a ritualised underwater dance, then deposits a little packet of sperm called a spermatophore for her to pick up. Wikipedia
Emperor Newt
- The emperor newt's bright orange head, ridge and warty bumps are a warning to predators that its skin is packed with poison, and those orange bumps running down its sides are the poison glands themselves. Wikipedia
- When an emperor newt is grabbed, the tips of its ribs squeeze against the poison glands to push toxin out through the bumps along its back. Wikipedia
- To protect itself against a bite, the emperor newt has especially thick bone in the top of its skull and vertebrae. Wikipedia
Kaiser's Spotted Newt
- Kaiser's spotted newt lives in the wild in just a handful of highland streams in the Zagros Mountains of Iran and nowhere else on Earth. Wikipedia
- Collection for the wild-animal trade helped push this little Iranian newt to the brink, and it is now listed on CITES Appendix I so that international trade requires a permit. Wikipedia
- Its home streams dry up for part of the year, so Kaiser's newt moves out into the surrounding oak and pistachio woodland and waits out the dry spell in a resting state called estivation. Wikipedia
Aquatic Caecilian
- Despite its rubber-eel nickname, this animal is neither an eel nor a snake but a caecilian, a limbless amphibian that looks a lot like a giant earthworm. Wikipedia
- Nearly blind, every caecilian carries a pair of unique little tentacles on its face that sense chemicals, giving it a smelling and tasting sense beyond the nose. Wikipedia
- This caecilian is ovoviviparous, carrying its young for about 220 days before giving birth to three to seven fully formed babies in the water. Wikipedia
Every fact here is drawn from a named authority — AmphibiaWeb, Animal Diversity Web and the individual Wikipedia species pages — and checked against that source before it went up. We deliberately leave out the fun-sounding trivia that turns out to be a myth. How we fact-check →