Duba wurin da ke ƙasa sannan ka amsa tambayar daga baya a cikin harshe ɗaya kamar yadda wurin yake:  Hanyar wucewa: Gashin tsuntsaye ne na tsuntsaye (ko da yake yana cikin wasu dinosaur da ba a la'akari da su a matsayin tsuntsaye na gaskiya ba). Suna sauƙaƙe tashi, suna ba da rufi wanda ke taimakawa cikin thermoregulation, kuma ana amfani da su a cikin nuni, ɓoyewa, da sigina. Akwai fuka-fuki iri-iri, kowanne yana da nasa manufa. Gashin gashin gashi ne na epidermal wanda ke haɗe da fata kuma yana tashi ne kawai a cikin takamaiman hanyoyin fata da ake kira pterylae. Ana amfani da tsarin rarraba waɗannan hanyoyin gashin tsuntsaye (pterylosis) a cikin haraji da tsarin. Tsarin da bayyanar gashin tsuntsaye a jiki, wanda ake kira gashin tsuntsaye, na iya bambanta tsakanin nau'in ta hanyar shekaru, matsayi na zamantakewa, da jima'i. Gashin tsuntsaye yana canzawa a kai a kai; gashin tsuntsaye na tsuntsaye wanda ya canza bayan haifuwa an san shi da gashin tsuntsaye "marasa haihuwa", ko kuma a cikin ma'anar Humphrey-Parkes" ainihin " gashin tsuntsaye; gashin tsuntsaye ko bambancin gashin tsuntsaye na asali an san su a karkashin tsarin Humphrey-Parkes a matsayin gashin tsuntsaye " madadin ". Moulting na shekara-shekara ne a yawancin nau'ikan, kodayake wasu na iya samun moults biyu a shekara, kuma manyan tsuntsaye masu cin nama na iya canzawa sau ɗaya kawai a cikin fewan shekaru. Tsarin motsi ya bambanta tsakanin jinsuna. A cikin passerines, ana maye gurbin gashin tsuntsaye ɗaya a lokaci guda tare da na farko na farko. Lokacin da aka maye gurbin na biyar na na shida na farko, na farko na farko sun fara sauka. Bayan da aka yi amfani da na'urorin ciki na ciki, na biyu da suka fara daga cikin ciki sun fara saukewa kuma wannan yana zuwa gashin tsuntsaye na waje (centrifugal moult). Babban murfin firamare ana canza shi a cikin lokaci tare da na farko wanda suka haɗu da shi.Kadan adadin nau'ikan, kamar ducks da geese, sun rasa dukkan gashin tsuntsayen su a lokaci guda, suna zama na ɗan lokaci. A matsayinka na ƙa'ida, gashin wutsiyar wutsiyar da aka maye gurbin farawa tare da ma'aurata na ciki. Duk da haka ana ganin moults na centripetal na gashin wutsiyoyi a cikin Phasianidae. An gyara motsi na tsakiya a cikin gashin wutsiyar woodpeckers da treecreepers, a cikin cewa yana farawa da na biyu mafi tsakiya biyu na gashin gashi da...  Tambaya: Waɗanne gashin tsuntsaye ne ake maye gurbinsu da farko?
gashin tsuntsaye