Most birds with bright yellow or red feathers — think goldfinches and cardinals — use pigments called carotenoids to make those colors. "The reason that a bird's egg's yolk is a bright yellow ...

Why are some parrot feathers yellow and others are red? And what role do psittacofulvins play in this variation? Rosy-faced lovebirds have different boldly colored feathers because of an ...

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.

26.5 x 20 cm. (10.4 x 7.9 in.) Subscribe now to view details for this work, and gain access to over 18 million auction results. Purchase One-Day Pass ...

But the colors in parrots’ plumage comes from chemicals ... oxidizes psittacofulvins to change their hues from red to yellow. Reds arise from psittacofulvins with an aldehyde end group, and ...

Roberto Arbore and colleagues explored how psittacofulvins are biochemically modified to produce yellow-to-red and green hues in parrot plumage. Arbore et al. found that much of the color ...