American bullfrog
Lithobates catesbeianus
The American bullfrog starts as a floating film of eggs and may spend a year or more as a large tadpole before it transforms. We follow each stage…
Thin skin, big voices and wild life cycles.
Frogs and toads breathe partly through their skin and usually start life as swimming tadpoles that later change into land-dwelling adults, although a few species skip stages. That thin, moist skin explains a lot: it is why some species are poisonous, why many are sensitive to pollution, and why a single fungus has hit amphibians so hard.
Each article takes one species and one big idea: a frog you can almost see through, a frog that survives being frozen, a call that carries across a pond, a parent that carries the eggs. The category closes with the chytrid fungus, the disease behind many recent amphibian declines.
Frog and toad statuses are reassessed as new surveys come in, so you will see a consultation date on every conservation note. We do not give advice on catching or keeping wild amphibians.
Play a round with any of them in the Terrarium to unlock the full article.
Lithobates catesbeianus
The American bullfrog starts as a floating film of eggs and may spend a year or more as a large tadpole before it transforms. We follow each stage…
Anaxyrus americanus
Scientists file every toad under frogs, yet the word still points to a real group, the true toads. The American toad is a handy test case for the…
Rhinoderma darwinii
Male Darwin's frogs guard their eggs, then take the young into a vocal sac and carry them for roughly six to ten weeks, depending on the source.…
Hyalinobatrachium fleischmanni
Fleischmann's glass frog has a see-through belly, and a 2022 study found that sleeping frogs tuck about 89% of their red blood cells into the…
Phyllobates terribilis
The golden poison frog of Colombia stores batrachotoxins in its skin, but the research points to its diet, not its own glands, as the source.…
Conraua goliath
The goliath frog is the largest living frog, with adults commonly 20 to 30 centimeters long and the largest somewhat more. The smallest known…
Atelopus zeteki
The Panamanian golden frog is a bright yellow frog of Panama that Smithsonian's National Zoo describes as extinct in the wild. Sources name the…
Pseudacris crucifer
Male spring peepers fill early-spring nights with a single clear whistle from an unusually large vocal sac, while females listen and choose. We…
Lithobates sylvaticus
The wood frog survives winter partly frozen: ice forms under its skin, its heart stops, and glucose and urea protect its cells until spring. We…