An kiyasta cewa aƙalla shekaru 15.000 da suka gabata, kare da mutumin sun fara dangantaka ta kud da kud, wanda aka ƙarfafa shi a kan lokaci. Duk da wannan, fannoni da yawa da suka dabaibaye wannan dabba suna ci gaba da zama babban sirri a gare mu, don haka ake aiwatar da su akai-akai karatun kimiyya domin neman karin bayani game dashi. A ƙasa muna tattara wasu abubuwan ban sha'awa da aka samu a cikin waɗannan karatun.
1. Mafi girman nauin canine shine Babban Dane ko Mastiff na Jamusanci, asalinsa daga Jamus, yayin da ƙarami shine Chihuahua, daga Meziko. A nasa bangaren, karen da ya fi nauyi shi ne Saint Bernard, daga tsaunukan Switzerland, wanda zai iya kaiwa kilogiram 120.
2. Lokacin da aka haife su, karnuka basa iya gani ko jin komai. Koyaya, idan suka balaga zasu iya ji sauti a nesa da kusan mita 225. Hakanan, hangen nesan su na dare ya fi namu godiya ga abin da ake kira tapetum lucidum, wani tsari da yake gefen idanunku.
3. Suna iya rarrabewa game da kalmomi 160, 200 a wasu yanayi, da kuma gano sautin muryarmu. Waɗannan su ne ƙarshen binciken da Jami'ar British Columbia ta yi, a Vancouver (Kanada), a cikin 2013.
4. Mu mutane muna rabawa 75% na lambar kwayoyin halitta Tare da karnukan.
5. Yayin makon su na farko na rayuwa, kwikwiyo suna ciyarwa 90% na lokacin bacci, da kuma ciyarwa 10%.
6. Shekarar da ta gabata, wani binciken da kungiyar masana kimiyya na jami’ar Emory suka gudanar kuma jaridar ta wallafa shi Ƙungiyar Jama'a da Ƙananan Neuroscience, ya nuna cewa karnuka sun fi son karɓar shafawa na ƙaunatattun mutane kafin abinci.
7. Kare shi ne dabbar da ta dabaibaye mafi girma iri-iri, tare da fiye da 800 daban-daban.