Orange Flamingo Feathers
When I first arrived at the Audubon Zoo in New Orleans in January, I was startled by the first animals I saw - a group of flamingos whose feathers were bright orange. You can see in the photo that there's actually a lot of pink still there, but when looking at a group of birds, the orange in the top feathers was very dominant.

Apparently flamingos can range from bright orange to white depending on the amount of carotenoids in their diet. Pigment fades over time - which is probably why the newer feathers here are more orange than the older ones - but also, zoos apparently have supplements they can add to their flamingos' diets to control their color. So next time you see a group of perfectly coordinated pink flamingos, you might reflect on the idea that they're essentially manmade, even if they aren't plastic.