Sabbin bayanai game da yadda ake sarrafa dinosaur sun bayyana wani bangare dalilin da yasa bayan faduwar meteorite suka wayi gari cikin sauri.
Masana kimiyya daga Jami'ar Jihar Florida sun gano cewa dinosaur na kwai ƙwai. Kuma aƙalla wasu daga cikinsu sunyi hakan na dogon lokaci - har zuwa watanni shida. Wannan binciken zai iya sanya dalilan halakar wadannan dabbobi bayyane. Misali, tsuntsayen da ke yau suna rage karancin lokacin su na yin abu, hakan yasa basu cika damuwa da sauyin yanayi ba. Wataƙila, irin waɗannan canje-canje sun faru ne kimanin shekaru miliyan 66 da suka gabata, lokacin da wani tauraron sama mai nisan kilomita goma ya faɗi a duniyarmu. An buga labarin da aka sadaukar domin wannan a cikin mujallar Proceedings of the National Academy of Science.
Masana burbushin halittu sun binciko yadda hantsarin hakoran dentine yayi sauri a kan hakoran amfrayo na dinosaur na da. Gaskiya ne, har yanzu muna magana ne kawai game da nau'ikan dinosaur guda biyu, daya daga cikinsu ya kai girman dorina, dayan kuma - rago. Dangane da waɗannan abubuwan lura, amfrayo ɗin sun ɗauki watanni uku zuwa shida a ƙwai. Wannan nau'ikan ci gaba ya bambanta dinosaur daga kadangaru da kada, da kuma tsuntsayen da suke ƙyanƙyashe ƙwai ɗin da basu wuce kwanaki 85 ba.
Yana da matukar mahimmanci dinosaur din ba su bar kwayayen su ba kamar yadda suke tunani, amma sun kyankyashe su. Idan ba su yi haka ba, suna dogaro ne kawai da yanayin da ya dace, to da alama za a haifi sasansu zai yi ƙanƙan da yawa, tunda ba a kiyaye tsayayyen zafin jiki na tsawan wannan lokaci ba. Bugu da kari, a cikin irin wannan dogon lokacin, yiwuwar masu cin naman za su cinye kwan sosai ya karu.
Ba kamar dinosaur ba, kadangaru da kadoji ba sa kwai, kuma amfrayo yana tasowa a cikinsu saboda zafin yanayi. Dangane da haka, ci gaba yana da jinkiri - har zuwa watanni da yawa. Amma dinosaur, in ba duka ba, to aƙalla wasu sun yi jini-ɗumi har ma sun yi fitsari. Me yasa kwayayen su suka bunkasa cikin sauri? Zai yiwu, dalilin wannan shine girmansu - har zuwa kilogram da yawa, wanda zai iya shafar ƙimar girma.
Wannan binciken ya sanya tunanin baya cewa dinosaur kawai sun binciko ƙwai a cikin ƙasa da wuya. Tsawon watanni uku zuwa shida, tarin ƙwai waɗanda iyayensu ba su kiyaye su ba suna da ƙarancin damar rayuwa, kuma yanayin kwanciyar hankali ba za a iya kiyaye shi ba a duk wuraren da waɗannan dabbobin suke.
Amma mafi mahimmanci, koda tare da yanayin shiryawa, irin wannan dogon lokacin shiryawa ya sanya yawan mutanen dinosaur cikin rauni idan yanayi ya canza sosai. Wannan ya faru kusan shekaru miliyan 66 da suka gabata, lokacin da sanyin hunturu da wata yunwa ta sauka a Duniya. A irin wannan yanayin, dinosaur din ba zai iya sake kwai ba har tsawon watanni, tunda yana da matukar wahala a sami abinci a kusa. Mai yiwuwa wannan shine ya haifar musu da halaka.
