The Panamanian golden frog is one of more than 100 species of disappearing harlequin frogs.
For nonpoisonous frogs, the trick to not becoming dinner is to look poisonous — but not too poisonous. Scientists studied frogs in the Amazon rainforest in Ecuador, and this non-toxic frog, Allobates zaparo, has colorful patterns that tell predators that it is toxic and would not make a good meal. Although A. zaparo can't actually back up this threat, its coloration fools predators into looking elsewhere for food.
Chinese concave-eared torrent frogs have an ear for ultrasound, so other creatures don't hear them croak.
The painted frog (Atelopus ebenoides marinkellei), from Colombia. The survival of the harlequin frog provides hope that other species might survive the killer fungus.
Oophaga pumilio, the strawberry poison frog, is one of a number of species of amphibians and reptiles declining in lowland forests of Costa Rica.
A mountain yellow-legged frog (Rana muscosa) at Milestone Basin in Sequoia National Park.
Researchers found two new species of frog on their expedition to a once lost forest in Africa.
The purple frog is a burrowing species that spends most of the year up to 13 feet (four meters) underground feeding on termites.
Noblella pygmaea on a fingertip. The frog is about 0.45 inches (11.4 millimeters) long.
Infectious parasites cause missing limbs, extra limbs and other malformations in frogs--and farm watershed may be to blame.
Odorrana tormota frogs, shown here in an illustration, emit high-frequency ultrasound to compete with the din of their noisy surroundings.
Adult red-eyed treefrogs are the postcard-perfect mascot of tropical biology, but their eye-catching embryos get the cover of the November 2008 issue of the Journal of Experimental Biology.
A glass frog of the Nymphargus genus potentially new to science discovered in the mountains of the Darien in Colombia. Darien is a mountainous system isolated from the Andes Mountain range and is a recognized for its high biological diversity.
One of the species of frog (Sphaerotheca sp.) found in a pile of Asian elephant dung.
The newly-discovered golden frog of Supata could fit on the tip of your finger.
This burrowing frog (Cyclorana alboguttata) maximizes energy use to survive in a state of torpor for months or even years.
USGS scientists found this adult mountain yellow-legged frog on June 10 in Tahquitz Creek, a rediscovered population of the endangered frog in the San Jacinto Wilderness, San Bernardino National Forest, California.
A frog, Litoria sp., believed to be new to science, and which uses a loud ringing song to call for a mate, was discovered in a rainforest during a Conservation International (CI) led Rapid Assessment Program (RAP) expedition of Papua New Guinea's highlands wilderness in 2008.
The newly describe species of frog, Pristimantis educatoris, was collected in El Cope, in Panama's Omar Torrijos National Park, is about 0.8 to 1.6 inches (2 to 4 centimeters) long and has expanded, round and even finger disks and toes that distinguish it from other, closely related species. Its eye color varies from blood red to yellow-orange above and dark purple to dark grey below. The pupil is horizontal.
The smallest frog in the world would fit (with room for a buddy) on your fingertip.
This horned frog is unique to the Solomon Islands.
This frog is the offspring of two closely related species of endangered leaf frog.
Dendrobates leucomelas, a poisonous frog from Venezuelan Guiana, eats a special diet of ants and mites, which contain compounds that help the frog make its toxic secretions.
Poison frog Mantella madagascariensis. It derives its poison from a steady diet of alkaloid-rich ants. Image
Mating yellow treefrogs (Dendropsophus ebraccatus) laying egg larvae in water. The egg masses can be at the water surface and under water.
The Rana compotrix, one of two new frog species found in Lao PDR.
Truly arboreal frogs, red-eyed treefrogs spend most of their time in trees, with their limbs made for walking and their "hands" and "feet" adapted for grasping branches.
The primitive frog Ascaphus montanus can jump fine, but rather than a graceful landing this amphibian does a belly flop.
Caption: Tree frog.
The first lungless frog has been discovered lurking in the jungles of Borneo.
The Australian green tree frog (Litoria caerulea). It can apparently pee out surgical implants, shunting devices embedded in its their bladder, researchers find.
Macaya Breast-spot Frog, Eleutherodactylus thorectes, a Critically Endangered species in the Massif de la Hotte, Haiti. © Robin Moore/iLCP
Panamanian marsupial frog, Hemiphractus fasciatus, getting "swabbed", or tested, for the presence of the microscopic fungal pathogen, Batrachochytrium dendrobatis, which is sweeping through Central America, decimating entire amphibian communities.
The pesticide atrazine can turn male frogs into females that are able to mate and successfully reproduce. Here, two male frogs mating. The larger animal on the bottom has been completely feminized by atrazine exposure and can produce viable eggs.
Male spiny frogs from the tribe Paini sport spines and powerful forelimbs. The species Quasipaa boulengeri is from the mountains of Sichuan, China.
An adult La loma tree frog (Hyloscirtus colymba).
An Emei music frog, native to southwest China.
The Smithsonian's National Zoo maintains an active breeding program for the critically endangered Panamanian golden frog.
A male microhylid frog (Liophryne schlaginhaufen) with froglets on his back.