But they maintain that the birds wouldn’t be pink (or bright blue, or green, or yellow) unless humans dyed the feathers. They posit that gender reveal parties are a likely explanation for a pink ...

Tim Felce (Airwolfhound) via Wikimedia Commons under CC BY-SA 2.0 Flamingos get their signature pink hue by eating ... yellow and green feathers? This query has long perplexed scientists, but ...

A combination of chemical and genetic analyses of the parrots revealed that ALDH3A2 is more active in yellow and green feathers than in red ones, suggesting that the enzyme helps feathers color swap.