zaki suna cikin rukunin dabbobin da ba a saba gani ba wadanda suka kasance muhimmiyar mahimmanci ga nunin gidan zoo tun daga ƙarshen karni na 18; membobin wannan rukuni koyaushe manyan dabbobi ne masu kashin baya kuma sun haɗa da giwaye, rhinoceroses, hippopotamuses, manyan dabbobi da sauran manyan kuliyoyi; zoos sun nemi tattara yawancin waɗannan nau'ikan kamar yadda zai yiwu. Ko da yake da yawa zoos na zamani sun fi zaɓaɓɓu game da abubuwan da suke nunawa, akwai fiye da 1,000 na Afirka da 100 na Asiya a cikin zoos da wuraren shakatawa na namun daji a duk faɗin duniya. Ana ɗaukar su a matsayin jakadan jinsuna kuma ana kiyaye su don yawon shakatawa, ilimi da dalilai na kiyayewa. Zaki na iya kaiwa shekaru sama da 20 a cikin bauta; Apollo, wani zaki mazaunin gidan Zoo na Honolulu a Honolulu, Hawaii, ya mutu yana da shekaru 22 a watan Agusta na shekara ta 2007. 'Yan uwansa biyu mata, waɗanda aka haifa a watan Agusta na shekara ta 1986, har yanzu suna da rai.
akwai fiye da 1,000 Afirka