Parrots apparently evolved larger brain sizes so they could solve problems that might otherwise have killed them, and this promoted their survival
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As expected, their study found a strong and positive correlation between relative brain size and life expectancy in parrots. Mr Smeele and his collaborators then statistically tested the data to determine which of the three hypotheses may show the strongest influence over brain size. Could parrots’ long juvenile period, or “childhood”, also influence longevity and brain size? Possibly.
coloured according to life expectancy , and phylogeny is based on Burgio et al. Genera are named if they contain at least two species. , play a role in brain size? Or perhaps feeding on sugar-rich nectar, as seen in many of the lories , may play a role in supporting an energetically demanding brain?
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