Frog

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Introduction1

Dictionary

frog : any of various largely aquatic leaping anuran amphibians (such as ranids) that have slender bodies with smooth moist skin and strong long hind legs with webbed feet — Webster

OneLook, Free Dictionary, Wiktionary

Encyclopedia

Frog is any member of a diverse and largely carnivorous group of short-bodied, tailless amphibians composing the order Anura. The oldest fossil “proto-frog” appeared in the early Triassic of Madagascar, but molecular clock dating suggests their origins may extend further back to the Permian, 265 million years ago. Frogs are widely distributed, ranging from the tropics to subarctic regions, but the greatest concentration of species diversity is in tropical rainforests. There are approximately 4,800 recorded species, accounting for over 85% of extant amphibian species. They are also one of the five most diverse vertebrate orders.

The body plan of an adult frog is generally characterized by a stout body, protruding eyes, cleft tongue, limbs folded underneath, and the absence of a tail in adults. Besides living in fresh water and on dry land, the adults of some species are adapted for living underground or in trees. The skin of the frog is glandular, with secretions ranging from distasteful to toxic. Warty species of frog tend to be called toads but the distinction between frogs and toads is based on informal naming conventions concentrating on the warts rather than taxonomy or evolutionary history; some toads are more closely related to frogs than to other toads. Frogs’ skins vary in color from well-camouflaged dappled brown, grey and green to vivid patterns of bright red or yellow and black to advertise toxicity and warn off predators.

Frogs typically lay their eggs in water. The eggs hatch into aquatic larvae called tadpoles that have tails and internal gills. They have highly specialized rasping mouth parts suitable for herbivorous, omnivorous or planktivorous diets. The life cycle is completed when they metamorphose into adults. A few species deposit eggs on land or bypass the tadpole stage. Adult frogs generally have a carnivorous diet consisting of small invertebrates, but omnivorous species exist and a few feed on fruit. Frogs are extremely efficient at converting what they eat into body mass. — Wikipedia

Encyclopædia Britannica

Portal

Frogs and toads (Wikipedia)

Search

WolframAlpha

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Inspiration

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Innovation

Science

You Can See the Living Heart of This Glass Frog (Mindy Weisberger, Live Science)
Glass frog (Encyclopædia Britannica)
Glass frog (Wikipedia)

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Preservation

History

Famous Frogs (Frogs on Ice)

Library

WorldCat, Library of Congress, UPenn Online Books, Open Library

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Participation

Education

Course

OER Commons: Open Educational Resources

Community

News

Science Daily, Phys.org, NPR Archives

Book

ISBNdb

Government

Document

USA.gov

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Expression

Note: This is a 360° Video — press and hold to explore it!

Fun

List of fictional frogs and toads (Wikipedia)

Poem

OEDILF: The Omnificent English Dictionary In Limerick Form

Music

Song Lyrics

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More News …

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Related

Here are links to pages about closely related subjects.

Knowledge Realm

Terrestrial

Sphere Land, Ice, Water (Ocean), Air
Ecosystem Forest, Grassland, Desert, Arctic, Aquatic

Life Cell, Gene, Tree of Life
Microorganism
Plant Flower, Tree
Animal
Invertebrate Cuttlefish, Octopus, Ant, Bee, Butterfly, Spider, Lobster
Vertebrate Fish, Seahorse, Ray, Shark, Frog, Turtle, Tortoise, Dinosaur
Bird, Ostrich, Owl, Crow, Parrot
Mammal Bat, Rabbit, Giraffe, Camel, Horse, Elephant, Mammoth
Whale, Dolphin, Walrus, Seal, Polar Bear, Bear, Cat, Tiger, Lion, Dog, Wolf
Monkey, Chimpanzee, Human

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Notes

1.   The resources on this page are are organized by a classification scheme developed exclusively for Cosma.