Amphibians (Amphibia)

The red-eyed tree frog is a vibrant, iconic inhabitant of Central and South American rainforests. With its bright green body, blue-and-yellow striped flanks, orange webbed feet, and striking, blood-red eyes, it is a master of color. During the day, it tucks its legs close and closes its eyes to blend in with green leaves. If disturbed, it flashes its bright colors and bulging red eyes to startle predators, a defense mechanism known as 'startle coloration'.

The Poison Dart Frog is a group of small, brightly colored amphibians native to the tropical rainforests of Central and South America. They are famous for their extremely toxic skin secretions, which indigenous tribes have used for centuries to poison the tips of blowdarts. Their brilliant, vibrant coloration serves as an warning sign to warn predators of their toxicity. Despite their name, captive-bred poison dart frogs are entirely harmless as their toxicity is derived from their wild diet.

The axolotl, also known as the Mexican walking fish, is a unique salamander famous for its smiling appearance and remarkable regenerative abilities. Unlike most amphibians, axolotls exhibit 'neoteny', meaning they never undergo metamorphosis to become land-dwelling adults. Instead, they remain aquatic, keeping their larval features—like feathery external gills and a tail fin—throughout their entire lives. They are highly studied by scientists because they can regenerate entire limbs, spinal cords, and even parts of their hearts and brains without scarring.

The Golden Mantella is a small, brilliantly colored frog native only to a tiny region of Madagascar. With its bright orange skin, it resembles South American Poison Dart Frogs, exhibiting a similar evolutionary path of toxicity and warning coloration to deter predators.

The Tiger Salamander is one of the largest land-dwelling salamanders in North America. Spending most of their lives underground in burrows, these brightly patterned amphibians are nocturnal predators that return to vernal pools in spring to breed.

The Spotted Salamander is a colorful amphibian native to the hardwood forests of eastern North America. Easily identified by the two rows of bright yellow spots on its black back, this secretive salamander spends its life hidden under damp leaf litter and logs, emerging only to breed in spring.

The Hellbender, also known as the snot otter or devil dog, is the largest species of salamander in North America and the third-largest in the world. Fully aquatic, hellbenders live under large rocks in fast-flowing, clean mountain streams, breathing entirely through their wrinkled skin.

The Cane Toad is a large, heavily built amphibian native to Central and South America. Infamous for its introduction to Australia in 1935 to control sugar cane beetles, it has become one of the world's worst invasive species, poisoning native predators with its toxic skin glands.

The Fire Salamander is a well-known European amphibian. Their striking black and yellow warning coloration signals that their skin contains toxic alkaloids.

The Goliath Frog is the largest living frog on Earth. Growing up to 32 cm in length, they are highly sensitive to river silt and inhabit clean, fast-flowing rainforest waterfalls.

The Alpine Newt is a colorful amphibian native to European mountain ranges. During the breeding season, males develop a striking blue-orange pattern to court females in cold alpine lakes.

The Indian Purple Frog, also known as the Pig-nosed Frog, is a highly unusual burrowing amphibian. They spend 50 weeks of the year living up to 4 meters underground, emerging for only 2 weeks to breed during monsoons.

Glass Frogs are famous for their translucent skin on their bellies, which allows a clear view of their internal organs, including their beating heart, liver, and digestive tract.

The Emperor Newt, or Mandarin Newt, is a striking orange-black amphibian native to high mountain valleys. Their bright orange ridges serve as a warning to predators.

The Marbled Salamander is a stout, burrowing amphibian. Unlike most other mole salamanders, they breed on land in dry autumn pools rather than in water during spring.

Also known as the 'Dumpy Tree Frog', this is a large, docile frog native to Australia. They possess a thick skin fold above the eyes and have adapted well to living near human homes.

The California Newt is a toxic amphibian. When threatened, they perform a defensive posture (unkenreflex) showing their bright orange belly, warning predators that their skin contains lethal tetrodotoxin.

The Spotted Reed Frog is a colorful, tiny amphibian. Inhabiting tall reed beds, they are known for their loud, musical clicking calls that echo across marshes at night.

The Golden Poison Frog is the most toxic animal on Earth. Its skin is saturated with batrachotoxin, which prevents nerves from transmitting impulses, causing heart failure in predators.

The Mudpuppy is a large, fully aquatic salamander. Unlike most amphibians that undergo metamorphosis, they exhibit neoteny, retaining their feathery external gills throughout their entire lives.

Also known as the 'Human Fish' or 'Cave Salamander', the Olm is a blind, subterranean amphibian adapted to complete darkness. They can survive up to 10 years without eating.

The Eastern Red-backed Salamander is a small, lungless amphibian. Lacking lungs entirely, they breathe oxygen directly through their moist skin, inhabiting damp forest soils.

The Pacific Tree Frog, also known as the Pacific Chorus Frog, is famous for its loud 'ribbit' call. It is the signature frog sound used in Hollywood films, despite being native only to the West Coast.

The Tomato Frog is a plump, brightly colored amphibian. Named for its striking orange-red color, they secrete a sticky, toxic white slime from their skin when threatened.

The Greater Siren is a giant, eel-like aquatic salamander growing up to 95 cm long. They lack hind legs entirely, possessing feathery red external gills, tiny front legs, and horny beak jaws.

The Amazon Milk Frog is a large, tree-dwelling amphibian. Named for the milky white poisonous secretion it produces when stressed, it features striking blue-grey skin with brown banding.

The Marbled Newt is a European amphibian featuring a striking green-and-black marbled skin pattern. Males develop a jagged dorsal crest during the aquatic breeding season.

The Surinam Toad is a flattened aquatic amphibian that resembles a dead brown leaf. Famous for its bizarre reproductive method, eggs embed into the female's back skin, hatching fully formed toadlets directly from her back.

The Dyeing Poison Dart Frog is one of the largest poison dart species. Featuring bright blue legs and yellow-black body patterning, their skin contains alkaloid toxins used by indigenous tribes to dye parrot feathers.

The European Fire-bellied Toad is a small aquatic amphibian famous for its bright orange-red warning belly. When threatened, they arch their back to display their bright underside (unkenreflex).

The Northern Two-lined Salamander is a small, energetic lungless salamander. Found under rocks along forest streams, they breathe through their moist skin and can drop their tail to escape predators.

The Yellow-banded Poison Frog, or Bumblebee Poison Frog, features striking black and bright yellow bands. It is one of the few poison dart frogs that aestivates in dry seasons.