Amphibian

Native to Cameroon and Equatorial Guinea, the goliath frog is the world's largest frog. It is roughly the size of a house cat.

Tetrapods such as Ichthyostega lived about 365 million years ago. They had limbs and spent time on land, and are ancestors of amphibians and every other land vertebrate.

Andrias davidianus can reach nearly two meters in length, though wild populations are critically endangered after decades of overharvesting.

Many amphibians absorb oxygen across thin, moist skin. Lungless salamanders, the largest salamander family, rely on it almost entirely.

Caecilians burrow through tropical soil and have tiny eyes hidden under skin. Some species even let their young feed on a nutritious layer of the mother's skin.

These unique salamanders possess an unparalleled ability to regenerate complex body parts, including limbs, spinal cords, and even portions of their brains and hearts. This makes them a focus for regenerative medicine research, offering insights into healing and repair.

These amphibians can survive being frozen for weeks, with their heart and breathing stopping entirely. They produce a natural antifreeze (glucose) that protects their cells from ice crystal damage, allowing them to reanimate once temperatures rise.

The underside of these amphibians is so translucent that their heart, liver, and gastrointestinal tract are visible through their skin. Scientists believe this unique camouflage helps them blend with their leafy habitats, making them harder to spot.

These amphibians possess an extraordinary ability to regrow lost limbs, jaws, spinal cords, and even parts of their brains without scarring. This makes them a significant subject of regenerative medicine research due to their unique healing process.

Certain frog species, like the wood frog, can survive having up to 65% of their body water freeze into ice. They produce a natural antifreeze (glucose) that protects their cells, allowing them to thaw out and hop away when spring arrives.