Parrot pigmentation by functional group

This exercise is a part of Educator Guide: Parrot Pigmentation and Bat Metabolism / View Guide
A dusky lory parrot with black feathers and a ring of red color around its neck and on parts of its head looks at the camera with its beak slightly open.
A new study shows levels of an enzyme called ALDH3A2 can fine-tune parrot pigments to make their feathers — like...