Sannadkii 2011, cilmi-baarayaasha paleontologists waxay heleen fosil si wanaagsan loo xafiday oo ah awoowe afar-lugood oo amphibious ah oo nibiriga ah oo lagu magacaabo Peregocetus pacificus - daahfurka iftiiminaya iftiinka cusub ee naasleyda ee ka guuritaanka dhulka una gudbaya badda.
Awowayaasha nibiriyada iyo dolphins waxay ku socdeen dhulka qiyaastii 50 milyan oo sano ka hor gobollada hadda ka kooban qayb-hoosaadka Hindiya.
Cilmi-baadhayaasha Paleontologists waxay hore u heleen qayb ka mid ah lafo-foosaska noocyada Waqooyiga Ameerika kuwaas oo ahaa 41.2 milyan oo sano waxayna soo jeedinayaan in wakhtigan, cetaceans ay lumiyeen awoodda ay ku qaadi karaan miisaankooda iyo socodka dhulka.
Muunaddan cusub ee gaarka ah, oo lagu sharraxay daraasad lagu daabacay Abril 2019 joornaalka Current Biology, waxay jirtay 42.6 milyan oo sano waxayna bixisay macluumaad cusub oo ku saabsan horumarka cetaceans.
Fossil-ka ayaa laga helay meel 0.6 mayl (hal kiiloomitir) gudaha ah u jirta xeebaha Peru ee Baasifigga, ee Playa Media Luna.
Dheecaankeedu wuxuu daaqi jiray ciidda saxaraha ah, markii la qoday, cilmi-baarayaashu waxay heleen daanka hoose, ilkaha, laf dhabarta, feeraha, qaybo ka mid ah lugaha hore iyo kuwa dambe, iyo xitaa faraha dhaadheer ee awoowaha nibiriga kuwaas oo ay u badan tahay in la maro.
Iyada oo ku saleysan anatomy, saynisyahannadu waxay gaareen gunaanadka in cetacean-ka dhererkeedu yahay 13 cagood (afar mitir) uu labadaba socon karo oo dabbaalan karo.
Sida laga soo xigtay qoraaga hogaanka ah Olivier Lambert oo ka tirsan Machadka Royal Belgian ee Sayniska Dabiiciga ah, "Qayb ka mid ah laf dhabarta dabada waxay muujisay isku mid ah kuwa hadda jira naasleyda nus-biyoodka ah sida otters."
"Tani waxay ahaan lahayd xayawaan bilaabay inuu isticmaalo dabadiisa si uu u dabaasho, taas oo ka duwan cetaceans-ka hore ee Hindiya iyo Pakistan," ayuu yidhi Lambert.
Qaybo ka mid ah nibiriyada afarta lugood leh ayaa hore looga helay Masar, Nigeria, Togo, Senegal iyo Saxaraha Galbeed, laakiin aad bay u kala qaybsameen oo suurtogal ma ahayn in si go'aan looga gaaro in ay dabaalan karaan iyo in kale.
"Tani waa muunada ugu dhammaystiran ee abid laga helo nibiriga afar-lugood leh ee ka baxsan Hindiya iyo Pakistan," ayuu yidhi Lambert.
Haddii nibiriga ku yaal Peru uu u dabbaalan karo sida otter-ka, cilmi-baarayaashu waxay qiyaaseen in ay u badan tahay in ay ka soo gudubtay Atlantic oo ka soo jeeda xeebta galbeedka Afrika ilaa Koonfurta Ameerika. Natiijadu tahay qulqulka qaaradaha, masaafada waxay ahayd kala badh ta maanta, qiyaastii 800 mayl, bari-galbeed ee wakhtigaas ayaa fududayn lahaa socdaalkooda.
Natiijooyinkani waxa ay yaraynaysaa mala-awaal kale marka loo eego kan nibiriyada ay gaadheen Waqooyiga Ameerika iyaga oo sii maraya Greenland.
Pisco Basin, oo ka baxsan xeebta koonfureed ee Peru, waxay u badan tahay in ay hayso fossils badan, iyada oo la siinayo shuruudaha ugu wanaagsan ee ilaalinta. Dhakhaatiirta Paleontologists waxay u maleynayaan in "ay haystaan shaqo ugu yaraan 50 sano ee soo socda."
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