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   See also   OneLook

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

Frog (Encyclopædia Britannica)

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More News …

Frogs and Reptiles News -- ScienceDaily Snakes, lizards, alligators, frogs and toads. From habitat information to frogs in stem cell research, you will find all the reptile and amphibian news here.

  • Egyptian lagoon vital to Cyprus turtles
    on November 23, 2022 at 4:38 pm

    The number of green turtles breeding in Cyprus has risen in recent years -- but this bounce-back depends heavily on an Egyptian lagoon where many turtles feed, new research shows.

  • Groundbreaking insights into the evolution of...
    on November 17, 2022 at 11:42 pm

    A team of researchers has discovered new insights into the evolution of color patterns in frogs and toads -- collectively known as anurans. Animal color patterns can help them camouflage with their surroundings and avoid detection from preys or predators. Many anurans have a light stripe along their back, which, when observed from above, creates the optical illusion that the animal is split in two halves and confuses visually-oriented predators. Although this color pattern is widespread in […]

  • A hard pillbug to swallow: First X-rays of frog...
    on November 15, 2022 at 4:40 pm

    While it's anatomically impossible for a human to swallow their tongue, a new study shows that cane toads (Rhinella marina) achieve this feat each time they eat. Cane toads swallow prey using a complex pulley system of cartilage and muscle that travels so far down their throat, it butts up against their heart.

  • New critical period of embryonic sex...
    on November 15, 2022 at 4:40 pm

    Unlike humans, turtles, lizards and other reptiles -- such as crocodiles -- do not have sex chromosomes. Their sex is determined based on the environment, which makes them especially vulnerable to climate change. An increase in incubation temperatures could jeopardize the production of both sexes.

  • New pterosaur species found in sub-Saharan Africa
    on November 9, 2022 at 8:19 pm

    With wings spanning nearly 16 feet, a new species of pterosaurs has been identified from the Atlantic coast of Angola.


Phys.org - latest science and technology news stories Phys.org internet news portal provides the latest news on science including: Physics, Nanotechnology, Life Sciences, Space Science, Earth Science, Environment, Health and Medicine.

  • Researchers uncover insights into the evolution...
    on November 17, 2022 at 10:29 pm

    A team of researchers from NYU Abu Dhabi (NYUAD) has discovered new insights into the evolution of color patterns in frogs and toads—collectively known as anurans. Animal color patterns can help them camouflage with their surroundings and avoid detection from preys or predators. Many anurans have a light stripe along their back, which, when observed from above, creates the optical illusion that the animal is split in two halves and confuses visually-oriented predators. Although this color […]

  • Frog lenses can develop differently depending on...
    on November 16, 2022 at 2:52 pm

    When tadpoles become frogs, their body shape isn't all that changes.

  • A hard pillbug to swallow: First X-rays of frog...
    on November 16, 2022 at 9:09 am

    The phrase "to swallow one's tongue" has been around since at least the 1880s and has been repurposed in several languages to mean everything from falling silent to a general feeling of fear. While it's anatomically impossible for a human to swallow their tongue, a new study shows that cane toads (Rhinella marina) achieve this feat each time they eat.

  • Gliding treefrogs, mini-males and burrowing frogs...
    on November 9, 2022 at 6:51 pm

    A chocolate treefrog that looks like a Freddo. Burrowing frogs which live in trees. Long-nosed frogs named after Pinocchio. Frogs which go straight from egg to froglet without stopping at tadpole. And large treefrogs which can glide from tree to tree.

  • Floods can be a disaster for humans—but for...
    on November 9, 2022 at 5:26 pm

    Humans, as a rule, do not like floods. And three years of La Niña rains have meant Australians have had more than enough of floods.

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Related

Here are links to pages about closely related subjects.

Knowledge Realm

Terrestrial   (Earth)

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Ecosystem Forest, Grassland, Desert, Arctic, Aquatic

Tree of Life
Microorganism Virus
Prokaryote Archaea, Bacteria
Eukaryote Protist, Fungi, Algae, Protozoa (Tardigrade)
Plant Flower, Tree
Animal
Invertebrate
Cnidaria Coral, Jellyfish
Cephalopod Cuttlefish, Octopus
Crustacean Lobster, Shrimp
Arachnid Spider, Scorpion
Insect Ant, Bee, Beetle, Butterfly
Vertebrate
Fish Seahorse, Ray, Shark
Amphibian Frog, Salamander
Reptile Turtle, Tortoise, Dinosaur
Bird Penguin, Ostrich, Owl, Crow, Parrot
Mammal Platypus, Bat, Mouse, Rabbit, Goat, Giraffe, Camel, Horse, Elephant, Mammoth
Walrus, Seal, Polar Bear, Bear, Panda, Cat, Tiger, Lion, Dog, Wolf
Cetacean Whale, Dolphin
Primate 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.