scientists studied another parrot, the rosy-faced lovebirds, a species that displays both green (i.e., yellow psittacofulvin-containing) and red plumage patches. "The rosy-faced lovebird is a ...

Think of nature and we think of color: a red sunset ... of blue and yellow that creates the bird’s brilliant green plumage. Nature intended this color to protect the parrot, but it also brings ...