African grey tail feathers are red due to pigments called psittacofulvins. Congo parrots are larger and have bright red tails, while Timneh parrots have maroon tail feathers.
Their tails have helped African greys to survive and evolve. They remain an essential part of their survival today—the brighter the color of the tail feathers, the healthier the parrot.
Their tails keep predators away, defend territory, warn of danger, and assist with finding mates.
Find out more at:
https://www.allaboutparrots.com/why-do-african-grey-parrots-have-red-tails/
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