Editing Grylloblattidae (section)

==Habitat and distribution==
Grylloblattodea are nocturnal [[extremophile]]s typically found in [[leaf litter]] and under stones in extremely cold environments, usually at higher elevations. They are known to inhabit cold temperate forests to glaciers and the edges of ice sheets. Their optimal living temperature is between {{convert|1|-|4|C|F}}. They can be killed at colder temperatures due to ice formation in the body, so when the temperature drops below their optimal range they survive by living under snow pack near the soil.<ref name="grimaldi">{{cite book|title=Evolution of the Insects|author=David Grimaldi, Michael S. Engel |date=2005|chapter=Polyneoptera: Grylloblattodea: The Ice Crawlers |pages= 222–224 |publisher=[[Cambridge University Press]]| location=New York City |isbn=9780521821490}}</ref> They have a very narrow range of temperatures that they prefer and cannot withstand high temperatures; many species are killed when the temperature rises about 5&nbsp;°C above their optimal temperature. They move in response to the seasons so as to maintain an optimal temperature in their foraging habitat.<ref>{{Cite journal|last1=Schoville|first1=Sean D.|last2=Slatyer|first2=Rachel A.|last3=Bergdahl|first3=James C.|last4=Valdez|first4=Glenda A.|date=2015|title=Conserved and narrow temperature limits in alpine insects: Thermal tolerance and supercooling points of the ice-crawlers, Grylloblatta (Insecta: Grylloblattodea: Grylloblattidae)|journal=Journal of Insect Physiology|volume=78|pages=55–61|doi=10.1016/j.jinsphys.2015.04.014|pmid=25956197|issn=0022-1910}}</ref>

Grylloblattidae are patchily distributed in glaciers, caves, montane environments, and occasionally lower-elevation forests in western North America, East Asia (Korea and Japan), and Central Asia (Siberia, China, and Kazakhstan). They are predicted to occur in several other mountain chains in Asia, including parts of the [[Himalayas]].<ref name="china">{{cite journal |last1=Bai |first1=Ming |last2=Jarvis |first2=Karl |last3=Wang |first3=Shu-Yong |last4=Song |first4=Ke-Qing |last5=Wang |first5=Yan-Ping |last6=Wang |first6=Zhi-Liang |last7=Li |first7=Wen-Zhu |last8=Wang |first8=Wei |last9=Yang |first9=Xing-Ke |year=2010 |title=A Second New Species of Ice Crawlers from China (Insecta: Grylloblattodea), with Thorax Evolution and the Prediction of Potential Distribution |journal=PLOS ONE |volume=5 |issue=9 |pages=e12850 |bibcode=2010PLoSO...512850B |doi=10.1371/journal.pone.0012850 |pmc=2943926 |pmid=20877572 |doi-access=free}}</ref>