The feature to feed parrots cookies to breed and tame was removed in a patch due to outcry from the Minecraft community. In real-life, chocolate cookies can kill birds if fed to them and people felt that children who played the game would try to copy this. The feature was changed prior to the release of patch 1.12.

Feeding cookies to parrots was also a subtle reference to the song "Polly" by the band Nirvana.
Contributed by KnowledgeBase
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