I-yak noma i-jak iyinkomo enezinwele ezinde yomndeni wenyathi. Ihlala enkabeni ye-Asia, ikakhulukazi ezintabeni zase-Himalaya. Igama livela olimini lwaseTibet. Lesi silwane sibizwa nangokuthi inkabi ye-Tibetan grunt.
Ama-yaks amaningi ayafuywa futhi aphethwe abalimi noma imihambima. Ama-yak ambalwa endle asongelwa ukushabalala. Amaduna angaphezu kwamamitha amabili ubude endle, akalwa ukusuka phansi kuya emahlombe. Ama-yaks emapulazini acishe abe uhhafu walokho ubude.
Uboya be-yak bude futhi buwugqinsi. Lena yindlela enhle yokuthi bazifudumeze ngoba bahlala ezintabeni lapho kubanda khona. Ezinye izinkomo zazingenakukwazi ukuphila lapho.
Abantu bagcina ama-yaks ukuze benze uvolo nobisi lwabo. Basebenzisa uvolo ukwenza izingubo namatende. Ama-Yaks angathwala imithwalo esindayo futhi adonse izinqola. Yingakho nazo zisetshenziselwa umsebenzi wasendle. Ngemva kokuhlaba, banikeza inyama, futhi isikhumba senziwe ngesikhumba. Futhi, abantu bashisa ubulongwe bama-yak ukuze bafudumale noma bapheke okuthile emlilweni. Ubulongwe buvame ukuba yibo kuphela amafutha abantu ababa nawo lapho. Azisekho izihlahla phezulu ezintabeni.