Duba wurin da ke ƙasa sannan ka amsa tambayar daga baya a cikin harshe ɗaya kamar yadda wurin yake:  Hanyar wucewa: Hanyar zaki ita ce alama mafi kyau ta jinsin. Yana fara girma lokacin da zakuna suka kai shekara guda. Launi na Mane ya bambanta kuma ya yi duhu tare da shekaru; bincike ya nuna cewa launi da girmansa suna shafar abubuwan muhalli kamar matsakaicin yanayin zafin jiki. Tsawon gashin gashi a bayyane yake yana nuna nasarar gwagwarmaya a cikin alaƙar namiji da namiji; mutanen da ke da duhu suna iya samun tsawon rayuwar haifuwa da kuma tsira da zuriya, kodayake suna wahala a cikin watanni mafi zafi na shekara. Kasancewa, rashi, launi da girman gashin gashi suna da alaƙa da yanayin asali, balaga na jima'i, yanayi da samar da testosterone; ƙa'idar yatsa ita ce cewa duhu, mai cike da gashin gashi yana nuna dabba mai lafiya. A cikin gandun dajin Serengeti, zaki mata suna son maza masu kauri, masu duhu a matsayin ma'aurata. Babban dalilin da ake amfani da shi shine kare wuyansa da makogwaro a cikin fadace-fadace na yanki tare da abokan hamayya. Yanayi mai sanyi a gidajen namun daji na Turai da na Arewacin Amirka zai iya sa gashin ya yi nauyi. Zaki na Asiya yawanci suna da ƙarancin ƙarancin zaki na Afirka. Kusan duk zakunan namiji a cikin Pendjari National Park ko dai ba su da ƙaranci ko kuma suna da ƙarancin ƙaranci. An kuma ba da rahoton zakuna marasa zaki a Senegal, a cikin Dinder National Park na Sudan da Tsavo East National Park, Kenya. Namijin zaki na fari na asali daga Timbavati shima ba shi da maƙarƙashiya. An danganta hormone testosterone zuwa ci gaban mane; zakuna da aka yi wa al'ada sau da yawa ba su da ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙarancin ƙaran Karin testosterone na iya zama sanadin lionsan zaki da aka ruwaito a arewacin Botswana. Zane-zanen kogon lionsan Eurasian da suka ɓace kusan suna nuna farautar dabbobi ba tare da wani abu ba; wasu sun ba da shawarar cewa wannan hujja ce cewa da gaske ba su da wani abu. Saboda farautar yawanci ya haɗa da ƙungiyoyin zaki, duk da haka, wannan zato ya kasance ba a tabbatar da shi ba. A cikin kogon Chauvet akwai zane-zane na zaki biyu marasa kyau. Zaki daya yafi sauran duhu. Zakin zaki na iya samo asali ne daga...  Tambaya: A wane irin yanayi ne za a iya samun gashi mai nauyi?
Yanayin sanyi