These are organized by a classification scheme developed exclusively for Cosma. More…
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
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.
They are an important food source for predators and part of the food web dynamics of many of the world’s ecosystems. The skin is semi-permeable, making them susceptible to dehydration, so they either live in moist places or have special adaptations to deal with dry habitats. Frogs produce a wide range of vocalizations, particularly in their breeding season, and exhibit many different kinds of complex behaviours to attract mates, to fend off predators and to generally survive. — Wikipedia
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.
Do lizards dream like us?
on October 11, 2018 at 6:30 pm
Researchers have confirmed that lizards exhibit two sleep states, just like humans, other mammals, and birds. They corroborated the conclusions of a 2016 study on the bearded dragon and conducted the same sleep investigation on another lizard, the Argentine tegu. Their findings nevertheless point out differences between species, which raises new questions about the origin of sleep states. […]
Louisiana amphibian shows unique resistance to...
on October 9, 2018 at 7:51 pm
Amphibian populations around the world are declining due to a skin disease caused by fungus. However, an amphibian commonly found in Louisiana, the three-toed amphiuma, has shown a resistance to the fungus. […]
Nanoparticles to treat snakebites
on October 4, 2018 at 6:39 pm
Venomous snakebites affect 2.5 million people, and annually cause more than 100,000 deaths and leave 400,000 individuals with permanent physical and psychological trauma each year. Researchers have now described a new approach to treating snake bites, using nanoparticles to bind to venom toxins and prevent the spread of venom through the body. […]
The homing instinct of relocated snakes
on October 4, 2018 at 3:25 pm
A new study on the effects of relocating adders due to development has found that males will disperse from their release site -- with one even going so far as to return to his original home. […]
Tropical frogs found to coexist with deadly fungus
on October 3, 2018 at 2:27 pm
In 2004, the frogs of El Copé, Panama, began dying by the thousands. The culprit: the deadly chytrid fungus Batrachochytrium dendrobatidis. Within months, roughly half of native frog species there went locally extinct. A new study suggests that frogs remaining in El Copé developed the ability to coexist with chytrid fungus due to ecological and/or evolutionary changes. The results could mean good news for other areas hit hard by chytrid fungus. […]