Editing Frog (section)

==Distribution==
[[File:Wood Frog (Rana sylvatica) (25234151669).jpg|thumb|Although frogs are most diverse in warm regions, a few species like the [[wood frog]] live at the [[Arctic Circle]].]]

Frogs live on every continent except Antarctica, but they are not present on certain islands, especially those far away from continental land masses.<ref>{{cite web |url=http://magma.nationalgeographic.com/ngexplorer/0403/articles/mainarticle.html |archive-url=https://web.archive.org/web/20040306180404/http://magma.nationalgeographic.com/ngexplorer/0403/articles/mainarticle.html |url-status=dead |archive-date=March 6, 2004 |title=Freaky Frogs |publisher=National Geographic Explorer |access-date=July 13, 2012}}</ref><ref>{{cite encyclopedia |url=http://evolution-facts.org/Ev-V3/3evlch27.htm |title=Geographical Distribution |last1=Ferrell |first1=Vance |date=March 4, 2012 |encyclopedia=Evolution Encyclopedia |volume=3 |publisher=Evolution Facts |access-date=July 13, 2012 |archive-date=May 5, 2012 |archive-url=https://web.archive.org/web/20120505220038/http://www.evolution-facts.org/Ev-V3/3evlch27.htm |url-status=dead }}</ref> Many species are isolated in restricted ranges by changes of climate or inhospitable territory, such as stretches of sea, mountain ridges, deserts, forest clearance, road construction, or other human-made barriers.<ref>{{cite encyclopedia |url=http://www.teara.govt.nz/en/frogs/ |title=Story: Frogs |last1=Ryan |first1=Paddy |date=September 25, 2011 |encyclopedia=The Encyclopedia of New Zealand |access-date=August 20, 2012}}</ref> Usually, a greater diversity of frogs occurs in tropical areas than in temperate regions, such as Europe.<ref>{{cite journal |author1=Dahl, Chris |author2=Novotny, Vojtech |author3=Moravec, Jiri |author4=Richards, Stephen J. |year=2009 |title=Beta diversity of frogs in the forests of New Guinea, Amazonia and Europe: contrasting tropical and temperate communities |journal=Journal of Biogeography |volume=36 |issue=5 |pages=896–904 |doi=10.1111/j.1365-2699.2008.02042.x |bibcode=2009JBiog..36..896D |s2cid=13067241 }}</ref> Some frogs inhabit arid areas, such as deserts, and rely on specific adaptations to survive. Members of the Australian genus ''[[Cyclorana]]'' bury themselves underground where they create a water-impervious cocoon in which to [[aestivation|aestivate]] during dry periods. Once it rains, they emerge, find a temporary pool, and breed. Egg and tadpole development is very fast compared with those of most other frogs, so breeding can be completed before the pond dries up.<ref>{{cite web |url=http://frogs.org.au/frogs/species/Cyclorana/platycephala/ |title=''Cyclorana platycephala'' |date=February 23, 2005 |publisher=Frogs Australia Network |access-date=July 20, 2012}}</ref> Some frog species are adapted to a cold environment. The [[wood frog]] (''Rana sylvatica''), whose habitat extends into the [[Arctic Circle]], buries itself in the ground during winter. Although much of its body freezes during this time, it maintains a high concentration of glucose in its vital organs, which protects them from damage.<ref name=Exploratorium/>