Re: Did Feathers Evolve for Dispaly? We Still Don't Know!

[David Marjanovic <david.marjanovic@gmx.at>]

>  I've heard that zoos need to mix certain natural dyes into their
>  flamingo food, otherwise the birds turn white.

Yes, and those are carotenoids (such as beta-carotene, which is the dye 
of carrots, and vitamin A, the same molecule split in half).