Qeybtan hoos ku qoran ka dibna ka jawaab su'aasha ka dib luqadda la mid ah sida marinka: Passage: Discovery of Castorocauda lutrasimilis waa calaamadda ugu horeysa ee ah in qaraabada dhow ee naasleyda la qabsadeen in biyaha ka hor dinosaurs lumay xukunka 66 milyan oo sano ka hor, riixaya dib taariikhda lagu qiyaasay qaraabada naasleyda la qabsadeen in hab-nololeed semi-badda by 110 milyan oo sano. Iyada oo ku saleysan burburka la og yahay hadda, line naasleyda ma arki lahaa qaab kale semi-badda horumariyo ilaa Eocene. Sababtoo ah qaar ka mid ah haraagaha fossilized ayaa la helay, waxaa hore loo maleeyay in, ilaa Cretaceous <unk> Paleogene xadka (K<unk>Pg xadka), dhammaan naasleyda ahaayeen yar, dhulka ku nool ama geed-nool, xayawaanka habeenkii la mid ah shrews, hedgehows, treeshrews, ama tenrecs.
waxaa la helay masaafo yar oo la qoday