"Birdbrain" is hurled as an insult, because these brains are small and that supposedly limits their cognition. However, we know that birds are cognitively quite sophisticated. So how can that be, with such small brains? This paper argues it's due to specific convergent evolution of mammalian and avian brains:
https://www.sciencedirect.com/science/article/pii/S1364661323002814
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