I WONDER - Why Do Male Birds Have More Colourful Feathers?

The video explores how birds use bright colors to attract mates and assert dominance. Male birds often have more vibrant feathers for these purposes. Some species, like bearded vultures, even dye their feathers using red soil to enhance their appearance and demonstrate dominance.

What is unique about the bearded vultures in terms of their appearance?

What method do bearded vultures use to dye their feathers?