Ososayensi abavela eCanada bathole e-Arctic izinsalela zesidalwa esinezimpaphe esasihlala emhlabeni cishe eminyakeni eyizigidi ezingamashumi ayisishiyagalolunye edlule. Ngenxa yalokhu okutholakele, izazi ze-paleontologists zathola umbono wokuthi isimo sezulu sase-Arctic sasinjani ngalezo zikhathi ezikude.
Inyoni eyatholwa abantu baseCanada kwakuyiTingmaitornis arctica. Ngokusho kwezazi ze-paleontologists, wayenamazinyo futhi wazingela izinhlanzi ezinkulu ezidlayo. Babuye bathi le nyoni ingukhokho wezinhlanzi zasolwandle zesimanje futhi ingaze icwile ifuna ukudla ngaphansi kwamanzi.
Kuyathakazelisa ukuthi lokhu okutholakele kwaholela eziphethweni ezimangazayo. Uma kubhekwa izinsalela, eminyakeni eyizigidi ezingama-90 eyedlule, isimo sezulu sase-Arctic sasingahlobene nanamuhla futhi sasifana kakhulu nesimo sezulu saseFlorida sanamuhla.
Izinsalela zavumela ososayensi ukuthi bakhe imibono ethile ngokuthi yiziphi izinguquko zezulu ezenzeka esifundeni sase-Arctic e-Upper Cretaceous. Isibonelo, ososayensi bangaphambilini, yize babazi ukuthi isimo sezulu sase-Arctic sangaleso sikhathi sasifudumele kunalesi sesimanje, babecabanga ukuthi ebusika i-Arctic isambozwe yiqhwa.
Okutholakele kwamanje kukhombisa ukuthi bekufudumele kakhulu lapho, ngoba izilwane inyoni enjalo ebingazondla ngayo zingaba khona kuphela esimweni sezulu esifudumele. Ngenxa yalokho, umoya we-arctic wangaleso sikhathi wawungashisa uze ufike kuma-degrees Celsius angama-28.
Ngaphezu kwalokho, ososayensi be-paleontologists basanda kuthola ugebhezi lwesilwane esingaziwa esasilele eCalifornia. Ubani ongukhakhakhayi akukacaci okwamanje, kodwa kuvezwa imibono yokuthi kwakuyisilwane esikhulu esasiphila okungenani eminyakeni eyizinkulungwane ezingama-30 eyedlule. Ngaphezu kwalokho, ukufa kwesilwane kuhlotshaniswa nokupholisa komhlaba. Uma ukucabanga kuqinisekisiwe futhi kuvela ukuthi kuningi kakhulu, khona-ke kuzoba izinsalela zakudala kakhulu kulo lonke izwekazi laseNyakatho Melika.
