Albinism and leucism

Yup, that’s all about accurancy and how another person can interpret your words.

Given all that was said above, what would be an acceptable term to describe something like this without getting deep into genetics? Just “depigmentation”?

Yes, in thrushes progressive depigmentations are common, but to say for sure you need to watch the bird for some months at least.

What would you say about this one?
https://www.inaturalist.org/observations/36126853

Thanks.

Same, either progressive depigmentation or neural crest disorder (like piebaldism), either way can be called a depigmentation.

Thanks!

I put a link to your comment above, in the observation.