The list
On this page11
What the list is
50 CFR 10.13, whose stated purpose is "to inform the public of the species protected by regulations that enforce the terms of the MBTA".
Two formats
Alphabetical and taxonomic, so you can find a species by the name you know it by or by where it sits in the classification.
Following a published checklist
Taxonomy and nomenclature follow the American Ornithological Society Checklist of North American Birds, with supplementary reference to the Clements Checklist for species the primary source does not cover.
Which means names change
Taxonomy is revised, species are split and merged, and the list is amended. A name that was right a decade ago may not be the current one.
So this property does not reproduce any of it
A catalog page listing protected species from memory would be wrong somewhere, out of date eventually, and relied on by somebody. The useful instruction is to check the list.
That is a deliberate omission, not an oversight
This library quotes regulations precisely where it can and refuses to paraphrase where paraphrasing would be acted on. This is the clearest case of the second.
What you actually need to know
The species of bird the feather came from. Everything else follows from that one fact and a lookup.
Which a supplier should be able to tell you
And if a supplier cannot say what bird a material came from, that is an answer about the supplier.
Other statutes reach other materials
CITES, the Endangered Species Act and the Lacey Act can each apply to exotic tying materials independently of the MBTA. None of them is read here and none should be assumed to be satisfied by this page.
The practical route for a working tyer
Buy from the mainstream trade, which sells domesticated poultry, and keep the exotic and inherited material questions separate and properly advised.