The small Central American Dendrobates pumilio calls from the leaves of herbaceous plants. Intrusion into a territory of one calling male by another results in a wrestling match that terminates only after one male has been thrown off the leaf. Males of the Central American dendrobatid Colostethus inguinalis have…
…female strawberry poison frog (Dendrobates pumilio; see arrow-poison frog) uses a different strategy to protect her young. She transports one or two newly hatched tadpoles from the leaves on which her eggs are laid to a bromeliad pool, which serves as a nursery. She then exhibits parental care by…
frog, any of various tailless amphibians belonging to the order Anura. Used strictly, the term may be limited to any member of the family Ranidae (true frogs), but more broadly the name frog is often used to distinguish the smooth-skinned, leaping anurans from squat, warty, hopping ones, which are called toads.
A brief treatment of frogs follows. For full treatment, seeAnura (frogs and toads).
In general, frogs have protruding eyes, no tail, and strong, webbed hind feet that are adapted for leaping and swimming. They also possess smooth, moist skins. Many are predominantly aquatic, but some live on land, in burrows, or in trees. A number depart from the typical form. Sedge frogs (Hyperolius), for example, are climbing African frogs with adhesive toe disks. The flying frogs (Rhacophorus) are tree-dwelling, Old World rhacophorids; they can glide 12 to 15 metres (40 to 50 feet) by means of expanded webbing between the fingers and toes (seetree frog).
The snout-vent length of frogs ranges from 9.8 mm (0.4 inch) in the Brazilian Psyllophryne didactyla to 30 cm (12 inches) in the West African Conraua goliath. The male anuran is generally smaller than the female.
Examine how a leopard frog's protruding independent eyes help it catch flies, earthworms, and other preyA leopard frog (Rana pipiens) eating an earthworm.
Although many frogs have poisonous skin glands, these toxins do not usually provide protection from predatory mammals, birds, and snakes. Edible anurans rely on camouflage; some blend with their backgrounds, while others change colours. Several species have bright colours on their underparts that flash when the frog moves, possibly confusing enemies or serving as a warning of the frog’s toxicity. Most frogs eat insects, other small arthropods, or worms (seevideo), but a number of them also eat other frogs, rodents, and reptiles.
Watch a tree frog lay eggs, and see through a glass frog's skin to glimpse its inner anatomyLearn about tree frogs of American tropical rainforests. Adhesive disks on their feet help them walk on slippery leaves without sliding, and they lay eggs; within the egg mass, embryos can be seen twitching. The tree frog with a translucent underside is called a glass frog (family Centrolenidae). (42 sec; 7 MB)
The annual breeding of frogs usually takes place in fresh water. In the sexual embrace (amplexus), the male clasps the female from behind and extrudes sperm over the eggs as they are ejected by the female. The eggs, laid in numbers varying from a few hundred to several thousand (depending on the species), then float off in clusters, strings, or sheets and may become attached to the stems of water plants; the eggs of some species sink. The tadpole hatches in a few days to a week or more and metamorphoses into a frog within two months to three years. During metamorphosis the lungs develop, limbs appear, the tail is absorbed, and the mouth becomes typically froglike. In some tropical frogs, the eggs are deposited on land and the young hatch as froglets, rather than tadpoles.
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Zug, George R.. "frog". Encyclopedia Britannica, 7 Jun. 2025, https://www.britannica.com/animal/frog. Accessed 19 June 2025.
