amphibians
85 questions tagged amphibians — spanning every one of the seven Ws.
Which Is the Largest Frog in the World?
The goliath frog of Cameroon and Equatorial Guinea is the largest frog, growing up to about 32 centimetres long and 3.3 kilograms.
Which Frog Is the Most Poisonous?
The golden poison frog of Colombia is the most poisonous frog, carrying enough batrachotoxin to kill about ten adult humans.
Why do frogs croak?
Male frogs croak mainly to attract females and warn rival males; each species has its own distinctive call.
What is an axolotl?
The axolotl is a Mexican salamander that keeps its juvenile features, such as feathery gills, for life and can regrow lost body parts.
Why do some frogs freeze solid in winter and survive?
Some frogs survive freezing because their bodies make glucose and other cryoprotectants that protect cells from ice damage. In species like the wood frog, up to about 65% of body water can freeze temporarily.
Why do some salamanders lose the ability to see as adults?
Some cave salamanders and other specialized species have reduced vision because living in darkness makes eyes less useful than other senses. Over time, evolution can shrink eye structures when they no longer provide an advantage.
Why do frogs use croaks and calls so much during mating season?
Male frogs call to attract females and warn rival males away. The species-specific calls help frogs find the right mate in noisy wetlands.
Why do some salamanders regenerate lost limbs?
Salamanders can regrow limbs because their cells can revert to a more flexible state and rebuild tissues. This regeneration is unusually strong compared with most vertebrates.
Why do toads have warty skin instead of smooth skin?
Toad skin looks warty because it contains many glands, bumps, and poison glands that help defend against predators. The rough texture is an adaptation, not actual skin warts.
Why do some frogs glow under ultraviolet light?
Some frogs fluoresce because chemicals in their skin absorb ultraviolet or blue light and re-emit it as visible glow. The discovery was reported in 2017 in several South American frogs.
Why do axolotls keep their gills when they grow up?
Axolotls usually keep their external gills because they are neotenic, meaning they retain juvenile traits into adulthood. They can still reproduce without undergoing full metamorphosis.
Why do frogs have such bulging eyes?
Bulging eyes help frogs see a wide field of view while staying low to the ground. They can watch for prey and predators without moving much.
Why do salamanders need moist skin to survive?
Salamanders rely partly on their skin for breathing, so it must stay moist for oxygen to pass through. Dry skin can quickly make gas exchange difficult.
Why do frogs and toads need water to reproduce?
Most amphibians lay eggs without hard shells, so the eggs can dry out easily. Water or very moist places protect the eggs and help the young develop.
Why do some frogs have poison in their skin?
Skin toxins help frogs avoid being eaten by predators. In some species, the poison comes from chemicals in their diet or from their own glands.
Why do many amphibians go through metamorphosis?
Metamorphosis lets amphibians switch from a water-based juvenile stage to a more land-capable adult form. It is controlled by hormones, especially thyroid hormones.
Why do frogs sit still for so long before jumping?
Frogs often sit motionless to avoid detection and conserve energy while waiting for prey or threats to appear. They are ambush hunters with a fast strike, not constant chasers.
Why do amphibians disappear from ponds after breeding season?
Many amphibians leave ponds because they only need water for breeding and early development. After that, they move to land or other habitats to feed and grow.
When was the axolotl first scientifically described?
The axolotl was first scientifically described in 1789. The species was named by the German naturalist Johann Friedrich Gmelin.
When was the first successful captive breeding of the hellbender reported?
The first successful captive breeding of hellbenders was reported in the early 21st century, with notable successes in the 2000s. These efforts became important for a species that has declined in many parts of its range.
When was the first major scientific report on frog chytrid fungus published?
The disease caused by chytrid fungus was first identified in the late 1990s, with landmark reports published in 1998. It became one of the biggest wildlife-disease discoveries ever made.
When was the first successful cloning of an amphibian achieved?
A famous early amphibian cloning breakthrough occurred in 1952, when nuclear transfer experiments were carried out in frogs. These studies became a landmark in developmental biology.
Why can some frogs freeze in winter without dying?
Some frogs survive freezing because they produce natural antifreeze-like chemicals that protect their cells and reduce ice damage. Wood frogs, for example, can freeze and thaw seasonally in parts of North America.
Why do some salamanders regrow lost limbs?
Salamanders can regrow limbs because their cells can revert to a more flexible state and rebuild tissues in a process called regeneration. Axolotls are the most famous example.
Why do frogs call so loudly at night?
Male frogs call to attract females and defend territories, and night air often helps sound travel farther. Their vocal sacs act like resonating balloons that amplify the call.
Why do some salamanders never fully become adults?
Some salamanders keep juvenile traits into adulthood because of neoteny, meaning their bodies mature without undergoing the full metamorphosis seen in many amphibians. Axolotls are the best-known example.
Why do frogs need moist skin to survive?
Many frogs breathe partly through their skin, so it must stay moist for gas exchange. If the skin dries out, breathing and water balance are disrupted.
Why do frogs have such sticky tongues?
Frog tongues are coated with mucus and can snap out extremely fast to catch prey. The tongue tip and saliva become even stickier during the strike.
Why do toads have warty skin?
Toads often have bumpy or warty-looking skin because of glands and raised textures that help with moisture control and defense. Some of those glands produce irritating toxins.
Why do axolotls keep their frilly gills?
Axolotls keep their external gills because they usually stay aquatic and do not undergo the full metamorphosis typical of many salamanders. Their gills help them breathe in water throughout life.
Why do frogs croak before rain?
Frogs often become more active before rain because humidity rises and water loss drops, making it easier to call and move. Many species breed more successfully in wet conditions.
Why do newts and salamanders stay so secretive during the day?
Many salamanders are nocturnal or hidden by day because moisture protects their skin and helps them avoid predators. Darkness and damp places suit their biology.
Why do some frogs have poisonous skin?
Some frogs produce toxins in their skin to deter predators. Bright colors often warn animals that the frog may be dangerous to eat.
What is metamorphosis in amphibians?
Metamorphosis is the dramatic body change some amphibians go through, such as a tadpole becoming an adult frog.
What is a caecilian?
A caecilian is a legless amphibian that looks a bit like a worm or snake and lives mostly underground or in water.
What is paedomorphosis in amphibians?
Paedomorphosis is when an adult amphibian keeps juvenile features, such as gills, instead of fully changing into the usual adult form.
What is direct development in frogs?
Direct development is a frog life cycle in which the young hatch as miniature frogs instead of free-swimming tadpoles.
What is a glass frog?
A glass frog is a frog with translucent skin on its underside, allowing some of its internal organs to be seen.
What is a poison dart frog?
A poison dart frog is a small brightly colored frog known for toxic skin compounds that can deter predators.
What is the tympanic membrane in frogs?
The tympanic membrane is the visible external eardrum in many frogs that helps them hear sounds.
What is vocal sac inflation in frogs?
Vocal sac inflation is when a frog expands a throat sac to amplify its call.
When did scientists first describe the axolotl species scientifically?
The axolotl was first scientifically described in 1789 by German naturalist Johann Friedrich Gmelin.
When was the green tree frog first scientifically described?
The Australian green tree frog was first scientifically described in 1790.
When did scientists first describe the African bullfrog?
The African bullfrog was first scientifically described in 1827.
When was the red-eyed tree frog first scientifically described?
The red-eyed tree frog was first scientifically described in 1862.
When was the poison dart frog first scientifically described?
The golden poison dart frog was first scientifically described in 1855.
When was the axolotl first used in scientific regeneration experiments?
Axolotls began attracting regeneration research in the late 19th century, especially from the 1860s onward.
When was the first scientifically recorded giant salamander described in Japan?
The Japanese giant salamander was first scientifically described in 1820.
When was the glass frog first scientifically described?
Glass frogs were first scientifically described in the early 19th century, with the group established in the 1800s.
When was the olm first scientifically described?
The olm was first scientifically described in 1768.
When was the common frog first scientifically described?
The common frog was first scientifically described in 1758.
When was the poison-arrow frog group first brought into scientific taxonomy?
Poison dart frogs were recognized in science during the 19th century, with many species described in the 1800s.
When was the cane toad first scientifically described?
The cane toad was first scientifically described in 1844.
Where do green tree frogs live naturally?
Green tree frogs live in eastern and northern Australia, and in nearby New Guinea. They are closely associated with moist habitats, gardens, and woodlands.
Where do poison dart frogs live in the wild?
Poison dart frogs live in tropical Central and South America. They are especially diverse in rainforests of countries such as Colombia and Ecuador.
Where do poison frogs get their toxins in the wild?
Poison frogs obtain many of their toxins from their natural diet in Central and South American forests. Their chemical defenses are tied to the habitats where they eat specific insects and other small prey.
Where do salamanders live naturally?
Salamanders live mainly in the Northern Hemisphere, especially in North America, Europe, and Asia. Many species depend on moist forests, streams, and cool mountain habitats.
Where do axolotls and related salamanders occur naturally in Mexico?
Several unusual salamanders occur in Mexico, especially in cool lakes, streams, and mountain wetlands. The axolotl is the best known, but Mexico is also home to many endemic amphibians.
Where do frogs go during dry seasons in tropical habitats?
Many frogs retreat into moist refuges such as burrows, leaf litter, or muddy riverbanks during dry seasons. The exact place depends on the species and local habitat.
Where is the world’s only known population of olm salamanders found in the wild?
Olms live in underground waters in the Dinaric karst of southeastern Europe, especially in Slovenia, Croatia, Bosnia and Herzegovina, and neighboring areas. They are cave-dwelling amphibians adapted to darkness.
Whose discovery showed that frogs can breathe through their skin?
This is closely associated with physiologist August Krogh, who helped demonstrate the importance of cutaneous respiration in amphibians. Frogs and many other amphibians can absorb oxygen through their skin, especially in water or at rest.
Whose studies helped explain how poison dart frogs get their toxins?
German herpetologist T. P. S. C. de Rooij and later researchers showed that many poison dart frogs do not make their own toxins from scratch. They often obtain poisonous alkaloids from their insect diet.
Whose work first revealed that axolotls can regrow lost limbs?
The regenerative abilities of axolotls were documented by 19th-century biologists, including Thomas Hunt Morgan, who studied them experimentally. Axolotls can regenerate limbs, spinal cord tissue, and parts of the heart and brain.
Whose research helped make the axolotl a model for regeneration biology?
Julian Huxley and later development biologists helped establish the axolotl as a classic research animal. Its ability to regenerate complex tissues has made it one of the most studied amphibians in science.
Whose name is attached to the amphibian body plan called the urostyle?
The urostyle is a key anatomical feature of frogs and toads, formed from fused tail vertebrae. It is not named after a person, but it is a classic part of frog anatomy used in jumping.
Whose studies first showed that frogs use their vocal sacs to amplify calls?
This is associated with early herpetologists and bioacoustics researchers who studied frog communication. The vocal sac acts like a resonating chamber, making calls louder without needing a large body.
Whose work first described the frog life cycle from tadpole to adult in scientific detail?
The metamorphosis of frogs was described by early naturalists, but it became a classic scientific subject through the work of researchers such as Johannes R. R. W. von Baer and later developmental biologists. Frogs undergo one of the most dramatic transformations in vertebrates.
Whose name is linked to the salamander family that includes the giant Japanese giant salamander?
The giant salamander family is Cryptobranchidae, a group of very ancient amphibians. It includes the Chinese giant salamander and the Japanese giant salamander, both among the largest amphibians on Earth.
Whose fossils showed that early amphibians evolved from lobe-finned fish?
The transition is strongly associated with fossils such as Acanthostega and Ichthyostega, studied by paleontologists including Jenny Clack. They revealed how vertebrates moved from water onto land.
Whose work helped identify the first fossil frog species from the Jurassic?
Early fossil frogs were described by paleontologists working on Jurassic deposits, including Richard Owen in the 19th century. Frog fossils are important because frogs already had many modern features very early in their history.
Whose discovery made the olm famous as a blind cave salamander?
The olm, Proteus anguinus, was described scientifically in the 18th century by Giovanni Antonio Scopoli. It became famous for living in cave waters and having reduced eyes and pigmentation.
Whose name is connected to the skin glands of amphibians that produce protective mucus?
Amphibian skin mucus is a general biological feature rather than a single eponymous discovery. These glands keep the skin moist and help with breathing, protection, and movement.
Whose name is attached to the disease that devastated amphibians worldwide, chytridiomycosis?
The chytrid fungus causing chytridiomycosis was identified through work by multiple researchers, including Joyce Longcore. It has caused major declines in amphibian populations across the globe.
Whose discovery first brought the giant salamander to Western science?
The Chinese giant salamander became known to Western science through 19th-century naturalists and later zoologists. It is now recognized as the largest amphibian in the world.
Whose work first described the glass frog as having transparent skin?
Glass frogs were described by herpetologists studying Central and South American amphibians. Their translucent undersides can reveal internal organs, making them among the most unusual frogs.
How do frogs breathe through their skin?
Many frogs absorb oxygen and release carbon dioxide through their thin, moist skin, especially when they are in water or resting. This skin breathing is called cutaneous respiration.
How do salamanders regenerate lost limbs?
Some salamanders can regrow entire limbs by forming a blastema, a mass of cells that rebuilds the missing part. This process can also involve regenerating parts of the tail, jaw, or spinal cord.
How do poison dart frogs get their poison?
Many poison dart frogs do not make their own toxins; they get them from what they eat, especially certain ants, mites, and other tiny prey. In captivity, they often lose toxicity because their diet changes.
How do axolotls keep their gills for life?
Axolotls often stay in a juvenile form for life, a trait called neoteny, so they keep their feathery external gills as adults. They usually do not undergo the full metamorphosis seen in many other salamanders.
How do frogs survive freezing temperatures?
Some frogs survive winter freezes by letting ice form in parts of their body while using glucose and other compounds to protect their cells. Species such as the wood frog can thaw out and resume activity in spring.
How do toads handle dry environments better than many frogs?
Toads usually have thicker, less permeable skin and spend more time on land than many frogs. Their bodies reduce water loss better, although they still need moisture and must avoid extreme dryness.
How do frogs and toads catch prey with their tongues so fast?
A frog’s tongue can snap out in a fraction of a second because it is attached at the front of the mouth and powered by specialized muscles. The tongue is sticky and can grab prey before it escapes.
How do frogs fertilize eggs in water?
Most frogs use external fertilization, where the female lays eggs and the male releases sperm over them in water. The eggs are usually coated in jelly, which protects them and keeps them moist.
How do frogs use their eyes to help swallow food?
A frog’s eyes can sink downward when it swallows, helping push food toward the throat. This eye movement is part of the swallowing process and not just a reflex for vision.
How do frogs make loud calls without lungs bursting?
Male frogs amplify their calls using vocal sacs, which act like resonating balloons. The sac helps project sound while the lungs and throat muscles control airflow safely.