While psittaciform parrots and cockatoos have many common anatomical attributes like zygodactyl feet and hooked bills, the cockatoos and parrots diverged from the ancestral parrots as separate lineages as early as 45 MYA ( fossil record ) or 66 MYA ( molecular analysis ) ( Wright 2008 ) during the period when Australia, South America and Antarctica were breaking away from the super-continent Gondwanaland where the ancestral parrots were believed to have evolved.
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Initially, the genus ( at that time only comprising the type species ) was considered to be a passeriform . " " N . " kistneri " was described 60 years later as a species of the genus " Primobucco ", which then thought to be related to woodpeckers because it had a zygodactyl foot or at least could turn the outer toe backwards; some years later, several genera ( including " Primobucco " and " Neanis " ) were put into a new family, the Primobucconidae, which were thought to be a primitive kind of puffbird.
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