I roto i te wā Cretaceous, he torutoru ngā momo o ngā pākiki taketake i whānui i runga i te Laurasian supercontinent (te Northern Hemisphere). i iti ratou i roto i te whakataurite ki te taupori o ētahi atu pepeke, e tohu ana anake e pā ana ki te 1% o te katoa taupori pepeke. ka pākiki riro rangatira i muri i te radiation urutau i te timatanga o te wā Paleogene. e te Oligocene me Miocene, i haere mai pākiki ki te tohu 20<unk>40% o katoa pepeke i kitea i roto i te putunga pūhui nui. o te momo i ora i roto i te Eocene wā, a tawhio noa kotahi i roto i te 10 hapu ora ki tenei ra.
i muri i te radiation urutau