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| − | {{otheruses}}
| + | <noinclude><translate></noinclude> |
| − | {{Taxobox_begin | color = pink | name = Frogs}}
| + | ===Frogs=== <!--T:1--> |
| − | {{Taxobox_image | image = [[Image:Pobblebonk.jpg|250px]] | caption = [[Pobblebonk]], Australia}}
| + | [[Image:Frogspawn closeup.jpg|190px|thumb|Frogspawn]] |
| − | {{Taxobox_begin_placement | color = pink}}
| + | [[Image:Tadpoles 10 days.jpg|190px|thumb||10 days: Tadpoles]] |
| − | {{Taxobox_regnum_entry | taxon = [[Animal|Animalia]]}}
| + | [[Image:Frog-Zhe.jpg||190px|thumb|8–12 weeks: Froglet]] |
| − | {{Taxobox_phylum_entry | taxon = [[Chordate|Chordata]]}}
| + | [[Image:Green-leopard-frog-in-swamp.jpg||190px|thumb|12–16 weeks: Adult frog]] |
| − | {{Taxobox_classis_entry | taxon = [[Amphibia]]}}
| + | The life cycle of frogs, like that of other amphibians, consists of four main stages: egg, tadpole, metamorphosis and adult. The reliance of frogs on an aquatic environment for the egg and tadpole stages gives rise to a variety of breeding behaviors that include the well-known mating calls used by the males of most species to attract females to the bodies of water that they have chosen for breeding. Some frogs also look after their eggs—and in some cases even the tadpoles—for some time after laying. |
| − | {{Taxobox_ordo_entry | taxon = [[Anura]]}}
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| − | {{Taxobox_end_placement}}
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| − | {{Taxobox_section_subdivision | color = pink | plural_taxon = Suborders}}
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| − | [[Archaeobatrachia]]<br />
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| − | [[Mesobatrachia]]<br /> | |
| − | [[Neobatrachia]]<br />
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| − | - <br /> | |
| − | [[Anura (family list)| Full list of families]]
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| − | {{Taxobox_end}}
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| − | '''Frog's''' are rubbish is the common name for [[amphibian]]s in the order, Anura. There is often a distinction made between frogs and [[toad]]s, based on appearance, however there is no scientific distinction. The only family exclusively given the common name "toad" is [[Bufonidae]], but many species from various other families are also called "toads". "[[True frog]]s" are of the family Ranidae.
| + | <!--T:2--> |
| | + | The life cycle of a frog starts with an egg. Eggs are generally laid in water, and an individual female may lay egg masses containing thousands of eggs. While the length of the egg stage depends on the species and environmental conditions, aquatic eggs generally hatch within one week. |
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| − | ==Characteristics==
| + | <!--T:3--> |
| − | {{main|Frog zoology}}
| + | Some frogs do not have the tadpole stage going from egg to adult shape e.g. New Zealand's native frogs (pepeketua) belong to the genus Leiopelma. |
| − | Frogs range in size from less than 50mm to 300mm (the [[Goliath frog]], ''Conraua goliath'', from Cameroon). Frogs can have horizontal [[pupil]]s, like [[tree frogs]] and true frogs, vertical pupils, like the [[painted frog]]s, or cross shaped eyes, like [[Peron's tree frog]] (''Litoria peronii'').
| + | Eggs hatch and continue life as tadpoles (occasionally known as polliwogs). Tadpoles are aquatic, lack front and hind legs, and have gills for breathing and tails with fins for swimming. Tadpoles are typically herbivorous, feeding mostly on algae, including diatoms that are filtered from the water through the gills. Some species are carnivorous at the tadpole stage, eating insects, smaller tadpoles and fish. The tadpole stage may be as short as a week, or tadpoles may overwinter and metamorphosis the following year in some species, such as the Midwife toad (''Alytes obstetricans'') and the Common Spadefoot (''Pelobates fuscus''). |
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| − | The skin unkeratinized and hangs loosely on the body because of the lack of [[loose connective tissue]], and can be smooth or warty.
| + | <!--T:4--> |
| | + | At the end of the tadpole stage, frogs undergo metamorphosis, in which they transition into adult form. Metamorphosis involves a dramatic transformation of body shape and function, as tadpoles develop hind legs and then front legs, lose their gills and develop lungs. Their intestines shorten as they shift from an herbivorous to a carnivorous diet. The final stage of development from froglet to adult frog involves the loss of the tail. |
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| − | Generally, frogs have long legs with webbed toes, and [[tree frogs]] have discs on their toes to aid in climbing. The true frogs have a tongue with two lobes on its free end; which is attached in front. Frogs have three eyelid membranes: one transparent to protect the eyes underwater, and two which are translucent to opaque like human eyelids. They have a [[tympanum]] on each side of their head, which is involved in hearing.
| + | <!--T:5--> |
| − | | + | After metamorphosis, young adults may leave the water and disperse into terrestrial habitats, or continue to live in the aquatic habitat as adults. Almost all species of frogs are carnivores as adults, eating invertebrates such as spiders, insects, snails, and slugs. A few of the larger species may eat prey such as small mammals, fish and smaller frogs. Some frogs use their sticky tongues to catch fast-moving prey, while others capture their prey and force it into their mouths with their hands. However, there are a very few species of frogs that primarily eat plants. Adult frogs are themselves preyed upon by birds, large fish, snakes, otters, foxes, badgers, coatis, and other animals. |
| − | ===Croaking===
| + | <br style="clear:both"> |
| − | Many species of frog have deep calls, or croaks. Frog noise tends to be spelt (for English speakers) as "crrrrk" in [[Britain]] and "ribbit" in the [[USA]]. This difference is due to the different species within each region(e.g. ''Rana temporaria'' in Britain and ''Rana pipiens'' (leopard frog) etc in the USA.) The croak of the American [[bullfrog]] ''Rana catesbiana'' is sometimes spelt "jug o' rum". The [[Ancient Greeks]] (for example [[Aristophanes]]) spelt the croak of the usual Greek species of frog as "korax" or "brekekekex co-ax co-ax": that species is probably ''Rana ridibunda''. Small tropical frogs tend to have higher-pitched calls. [[Rigveda]] book 7 hymn 103 describes frogs with different calls (''g<u>o</u>māyu'' = "having a voice like a cow's" and ''aj<u>a</u>māyu'' = "having a voice like a goat's") calling when the rains bring the breeding season.
| + | <noinclude></translate></noinclude> |
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| − | ===Poison===
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| − | Some species of frog secrete [[toxin]]s from their skin. These toxins deter predatory animals from eating them, and some are extremely poisonous to humans. Generally the frog obtains the poison from the insects or animals they eat. The Australian [[corroboree frog]]s ''pseudophryne corroboree'' and ''pseudophryne pengilleyi'' have been discovered to be able to manufacture a unique [[alkaloid]] which is not derived from their diet (Daly). Some natives of the [[Amazon_Rainforest|Amazon]] area extract poison from the [[poison dart frog]] and put it on their [[arrow]]heads when hunting. Poisonous frogs tend to advertise their toxicity with bright colours.
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| − | ==Distribution and status==
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| − | Frogs are found nearly worldwide, but they do not occur in [[Antarctica]] and are not present on many oceanic islands.
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| − | In many parts of the world, the [[Decline in frog populations|frog populations have declined]] drastically since the 1950s. Many environmental scientists feel that amphibians, and frogs in particular, may be excellent biological indicators of ecosystem function because of their location on the food web, their permeable skins, their typically bi-phasic life (in both water and on land). Although habitat loss is certainly one of the most important features of most declines; pollutants, climate change, parasitic infestation, introduction of non-indigenous predators/competitors, and infectious diseases (see [[Chitrid fungus]]) have also been implicated.
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| − | ==Life cycle==
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| − | The life cycle of frogs contains many stages. Typically, the male frogs of a species will assemble at a still water source. They will then call, collectively becoming a chorus of frogs. The call is unique to the species, and will attract females of that species.
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| − | The male and female frog, will then undergo [[amplexus]]. This involves the male mounting the female. The female then releases her egss, which the male frog covers with a sperm solution before the eggs make contact with the water. Once the eggs come in contact with the water, they will swell, and form a protective coating. The eggs are typically brown or black, with a clear, gelatine like, covering.
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| − | The eggs will hatch after a short time, releasing [[tadpoles]]. The tadpoles are entirely aquatic, and undergo the most develpoment in the life cycle. They will undergo [[metamorphisis]], in which they will develop legs, and lungs, to become a froglet, resembling an adult but retaining a vestigial tail. Finally the froglet develops into an adult frog. Typically, tadpoles are [[herbivore]]s, feeding mostly on [[alga]]e, whereas juvenile and adult frogs are rather voracious [[carnivore]]s.
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| − | Most temperate species of frog reproduce in the period between late autumn to early spring. In the [[UK]] most common frog populations produce frogspawn in February although there is wide variation in timing. Water temperatures at this time of year are relatively low and typically between four and 10 degrees celsius. Reproducing in these conditions helps the developing tadpoles because dissolved oxygen concentrations in the water are highest at cold temperatures. More importantly, reproducing early in the season ensures that appropriate food is available to the developing frogs at the right time.
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| − | <gallery>
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| − | Image:Frogspawn closeup.JPG|Frogspawn
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| − | Image:Tadpoles 10 days.JPG|10 days: Tadpoles
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| − | Image:Frog-Zhe.jpg|8–12 weeks: Froglet
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| − | Image:Green-leopard-frog-in-swamp.jpg|12–16 weeks: Adult frog
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| − | </gallery>
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| − | ==Diet and Predators==
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| − | Most frogs eat [[insect]]s such as [[mosquito]]es, earthworms, small [[fish]] and [[spider]]s. However, a few of the bigger species may eat larger prey, such as small [[mammals]] and smaller frogs. Some frogs use their sticky tongues effectively in catching fast-moving prey, while others capture their prey in their mouth with speed and agility.
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| − | Many animals eat frogs. These include [[birds]], large fish, [[snake]]s [[otter]]s, [[fox]]es, [[badger]]s, [[coati]]s etc. Tadpoles and eggs are predated by fish, and birds such as [[king fishers]].
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| − | ==Frogs in popular culture==
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| − | Frogs feature prominently in [[folklore]] and [[fairy tale|fairy tales]] in many cultures, such as the story of ''[[The Frog Prince]]''. Similarly, numerous [[fantasy]] settings (such as the [[Final Fantasy]] [[videogames]]) include [[spells (paranormal)|magic spells]] that turn people into frogs, such as the [[Frog (Chrono Trigger)| frog]] character in the [[videogame]] [[Chrono Trigger]].
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| − | *In the 1992 animated movie [[Freddie as FRO7]], Frederick, an enchanted frog prince with magical powers, becomes a modern-day secret agent.
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| − | *The [[crazy frog]] is a [[cartoon]] frog and character of the most downloaded ringtone in the [[United Kingdom | UK]].
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| − | *Probably the most famous frog in the entertainment world is the [[Muppet]] character [[Kermit the Frog]].
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| − | *Until recently, the American TV network The WB ([[Warner Brothers]]) used [[Michigan J. Frog]], a frog in a tuxedo as their logo. Michigan J. Frog was the singing, dancing star of the [[1955]] Warner cartoon, "[[One Froggy Evening]]".
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| − | *''[[Frogger]]'' is an early electronic [[arcade game]] which features a frog that must cross a busy road and river.
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| − | *Frogs fall from the sky in various urban myths and notably in the movie [[Magnolia (film)|Magnolia]]. This may derive from incidents when frogs are picked up by a [[tornado]], or when a sudden migration of frogs happens overnight.
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| − | *The behavior of frogs illustrating nonaction is a myth. ("Take a pot of hot water and a frog. Throw the frog into the pot. What do you think will happen? The obvious, of course: the frog will jump out. Who likes hanging around in a pot of hot water? Now ... [t]ake a pot of cold water, put the frog in it, and place the pot on the stove. Turn on the heat. This time something different will occur. The frog, because of the incremental change in temperature, will not notice that it is slowly being boiled." from "Life and Death in the Executive Fast Lane" by Manfred Kets de Vries) Professor Doug Melton, Harvard University Biology Department, says, "If you put a frog in boiling water, it won't jump out. It will die. If you put it in cold water, it will jump before it gets hot -- they don't sit still for you." [http://www.fastcompany.com/online/01/frog.html] A frog put anywhere that doesn't kill it will jump, "they don't sit still for you."
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| − | *[[Paul McCartney]]'s "[[Rupert Bear| Rupert]] and the Frog Song" was released in [[1984]] and reached no.3 in the British Charts.
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| − | ==External links== | |
| − | {{commons|Frog}}
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| − | {{cookbook}}
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| − | * [http://www-itg.lbl.gov/ITG.hm.pg.docs/Whole.Frog/Whole.Frog.html The Whole Frog Project] - Virtual frog dissection and anatomy
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| − | * ''[http://raysweb.net/specialplaces/pages/frogsdecline.html Disappearance of toads, frogs has some scientists worried]'' - ''San Francisco Chronicle'', April 20, 1992
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| − | *[http://www.thelilypad.org/ The Lily Pad] - Frog information, care, and culture
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| − | * [http://www.racingfrogs.org Racing Frogs Game] - Create, Train, Motivate and Feed your own little froggy friend
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| − | * [http://www.frogsonice.com/froggy/ The Froggy Page] - Frog fun
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| − | * [http://www.dartden.com Dart Den] - Dart frog resource and forums
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| − | * [http://www.xenbase.org/ Xenbase] - A ''Xenopus laevis'' and ''tropicalis'' Web Resource
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| − | * [http://markus.nolf.org/blog.php?p=160 Time-lapse video showing the egg's development until hatching]
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| − | * [http://www.movie-monsters.co.uk/frogs.html Frogs (1977) - when frogs go bad]
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| − | {{Link FA|eo}}
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| − | [[Category:Frogs]]
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| − | [[ar:ضفدع]]
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| − | [[ast:Xaronca]]
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| − | [[ca:Granota]]
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| − | [[da:Frø (padde)]]
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| − | [[de:Froschlurche]]
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| − | [[es:Rana]]
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| − | [[eo:Rano]]
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| − | [[fr:Grenouille]]
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| − | [[he:צפרדע]]
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| − | [[li:Kwakkers]]
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| − | [[nl:Kikker]]
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| − | [[no:Frosk]]
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| − | [[ja:カエル]]
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| − | [[pl:żaba]]
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| − | [[pt:Rã]]
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| − | [[simple:frog]]
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| − | [[sv:Grodor]]
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Frogs
The life cycle of frogs, like that of other amphibians, consists of four main stages: egg, tadpole, metamorphosis and adult. The reliance of frogs on an aquatic environment for the egg and tadpole stages gives rise to a variety of breeding behaviors that include the well-known mating calls used by the males of most species to attract females to the bodies of water that they have chosen for breeding. Some frogs also look after their eggs—and in some cases even the tadpoles—for some time after laying.
The life cycle of a frog starts with an egg. Eggs are generally laid in water, and an individual female may lay egg masses containing thousands of eggs. While the length of the egg stage depends on the species and environmental conditions, aquatic eggs generally hatch within one week.
Some frogs do not have the tadpole stage going from egg to adult shape e.g. New Zealand's native frogs (pepeketua) belong to the genus Leiopelma.
Eggs hatch and continue life as tadpoles (occasionally known as polliwogs). Tadpoles are aquatic, lack front and hind legs, and have gills for breathing and tails with fins for swimming. Tadpoles are typically herbivorous, feeding mostly on algae, including diatoms that are filtered from the water through the gills. Some species are carnivorous at the tadpole stage, eating insects, smaller tadpoles and fish. The tadpole stage may be as short as a week, or tadpoles may overwinter and metamorphosis the following year in some species, such as the Midwife toad (Alytes obstetricans) and the Common Spadefoot (Pelobates fuscus).
At the end of the tadpole stage, frogs undergo metamorphosis, in which they transition into adult form. Metamorphosis involves a dramatic transformation of body shape and function, as tadpoles develop hind legs and then front legs, lose their gills and develop lungs. Their intestines shorten as they shift from an herbivorous to a carnivorous diet. The final stage of development from froglet to adult frog involves the loss of the tail.
After metamorphosis, young adults may leave the water and disperse into terrestrial habitats, or continue to live in the aquatic habitat as adults. Almost all species of frogs are carnivores as adults, eating invertebrates such as spiders, insects, snails, and slugs. A few of the larger species may eat prey such as small mammals, fish and smaller frogs. Some frogs use their sticky tongues to catch fast-moving prey, while others capture their prey and force it into their mouths with their hands. However, there are a very few species of frogs that primarily eat plants. Adult frogs are themselves preyed upon by birds, large fish, snakes, otters, foxes, badgers, coatis, and other animals.
