Wulu minangka rambut wulu sing kandel sing nutupi kulit kewan sing beda-beda. Iki minangka ciri khas mamalia . Iki kalebu kombinasi rambut penjaga berminyak ing sisih ngisor lan ngisor sing kandel. Rambut penjaga njaga kelembapan saka kulit; underfur tumindak minangka kemul insulasi sing njaga kewan kewan anget.
[1]Wulu mamalia akeh kagunaane: nglindhungi, tujuan sensorik, anti banyu, lan kamuflase, kanthi panggunaan utama yaiku thermoregulation. [2] Jinis rambut kalebu definitif, sing bisa ngeculake sawise dawa; vibrissae, yaiku rambut sensori lan umume kumis; pelage, sing kalebu rambut penjaga, rambut ngisor wulu, lan rambut awn ; duri, yaiku jinis rambut penjaga kaku sing digunakake kanggo pertahanan, contone, porcupine ; bulu, yaiku rambut dawa sing biasane digunakake ing sinyal visual, kayata mane singa; velli, asring diarani "wulu mudhun," sing ngisolasi mamalia sing nembe lahir; lan wol, sing dawa, alus, lan asring kriting. :99 Dawane rambut bisa diabaikan ing thermoregulation, amarga sawetara mamalia tropis, kayata sloths, dawane wulu padha karo sawetara mamalia Arktik nanging kurang insulasi; lan, kosok baline, mamalia tropis liyane kanthi rambut cendhak duwe nilai insulasi sing padha karo mamalia Arktik. Kapadhetan wulu bisa nambah nilai insulasi kewan, lan mamalia Arktik utamane duwe wulu kandhel; contone, sapi kasturi duwe rambut pengawal kanthi ukuran 30 cm (12 in) uga underfur sing kandhel, sing mbentuk jas sing bisa mbukak udara, supaya bisa bertahan ing suhu −40 °C (−40 °F) . :162–163 Sawetara mamalia ara-ara samun, kayata unta, nggunakake wulu kandhel kanggo nyegah panas srengenge tekan kulit, supaya kewan tetep adhem; wulu unta bisa udakara 70 °C (158 °F) ing mangsa panas, nanging kulit tetep 40 °C (104 °F) . :188 Mamalia akuatik, kosok baline, nyepetake hawa ing wulune kanggo ngreksa panas kanthi njaga kulit supaya garing. :162–163
Referensi
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