Birds have white feathers for dating reasons, for display rituals etc.

Birds have black colored feathers for work.

White is a very weak color and easily damaged whereas black is a strong color and more resistant to the ravages of wind turbulence over time.

This is why long distance birds like the Albatross have black reinforcing on all flight control surfaces . . .

Think about it, where you going to park and repair your wing if you are half way between Fiji and Hawaii ? ? ?

Smart birds : )

/ hugs ; )

http://animals.nationalgeographic.com/animals/birds/albatross/