Songbirds are more colourful the closer they live to the equator
https://www.newscientist.com/article/2314776-songbirds-are-more-colourful-the-closer-they-live-to-the-equator/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home
Songbirds are more colourful the closer they live to the equator