Sticky notes heart shape skin#

Old English frosc remained in dialectal use in English as frosh and frosk into the nineteenth century, and is paralleled widely in other Germanic languages, with examples in the modern languages including German Frosch, Norwegian frosk, Icelandic froskur, and Dutch (kik)vors. The word is first attested in Old English as frogga, but the usual Old English word for the frog was frosc (with variants such as frox and forsc), and it is agreed that the word frog is somehow related to this. The origins of the word frog are uncertain and debated. It refers to the tailless character of these amphibians. The origin of the order name Anura-and its original spelling Anoures-is the Ancient Greek ' alpha privative' prefix ἀν- ( an-) 'without', and οὐρά ( ourá), meaning 'animal tail'.

Sticky notes heart shape skin#

The European fire-bellied toad ( Bombina bombina) has a slightly warty skin and prefers a watery habitat whereas the Panamanian golden frog ( Atelopus zeteki) is in the toad family Bufonidae and has a smooth skin. There are numerous exceptions to this rule. The use of the term frog in common names usually refers to species that are aquatic or semi-aquatic and have smooth, moist skins the term toad generally refers to species that are terrestrial with dry, warty skins. From a classification perspective, all members of the order Anura are frogs, but only members of the family Bufonidae are considered 'true toads'.

The use of the common names frog and toad has no taxonomic justification. Conservation biologists are working to understand the causes of these problems and to resolve them. The number of malformations among frogs is on the rise and an emerging fungal disease, chytridiomycosis, has spread around the world. More than one third of species are considered to be threatened with extinction and over 120 are believed to have become extinct since the 1980s. Frog populations have declined significantly since the 1950s.

They are also seen as environmental bellwethers, with declines in frog populations often viewed as early warning signs of environmental damage. Frogs produce a wide range of vocalizations, particularly in their breeding season, and exhibit many different kinds of complex behaviors to attract mates, to fend off predators and to generally survive.įrogs are valued as food by humans and also have many cultural roles in literature, symbolism and religion. 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. They are an important food source for predators and part of the food web dynamics of many of the world's ecosystems. Frogs are extremely efficient at converting what they eat into body mass. Frog skin has a rich microbiome which is important to their health. Adult frogs generally have a carnivorous diet consisting of small invertebrates, but omnivorous species exist and a few feed on plant matter. A few species deposit eggs on land or bypass the tadpole stage. The life cycle is completed when they metamorphose into adults. They have highly specialized rasping mouth parts suitable for herbivorous, omnivorous or planktivorous diets. The eggs hatch into aquatic larvae called tadpoles that have tails and internal gills. Adult frogs live in fresh water and on dry land some species are adapted for living underground or in trees.įrogs typically lay their eggs in water. Their skin varies in colour from well- camouflaged dappled brown, grey and green to vivid patterns of bright red or yellow and black to show toxicity and ward off predators. Frogs have glandular skin, with secretions ranging from distasteful to toxic. Warty frog species tend to be called toads, but the distinction between frogs and toads is informal, not from taxonomy or evolutionary history.Īn adult frog has a stout body, protruding eyes, anteriorly-attached tongue, limbs folded underneath, and no tail (the tail of tailed frogs is an extension of the male cloaca).

They are also one of the five most diverse vertebrate orders. Frogs account for around 88% of extant amphibian species. Frogs are widely distributed, ranging from the tropics to subarctic regions, but the greatest concentration of species diversity is in tropical rainforest. The oldest fossil 'proto-frog' Triadobatrachus is known from the Early Triassic of Madagascar, but molecular clock dating suggests their split from other amphibians may extend further back to the Permian, 265 million years ago. Variegated golden frog ( Mantella baroni) in the Ranomafana National Park of MadagascarĪ frog is any member of a diverse and largely carnivorous group of short-bodied, tailless amphibians composing the order Anura (ανοὐρά, literally without tail in Ancient Greek).