I can speak to this as I'm legally a resident of WA state although I've lived in Hawaii 24 years now.
This my opinion only!
In WA state he will be fined and possibly jailed/ on probation.
Were he in Hawaii and claimed to be Hawaiian not a thing would be done as
indiscriminate killing for cultural reasons is OK here.
If I sound "Jaded" it is because I've seen to much abuse based upon race.
I have to follow every rule Hawaiians don't.
Kind of like WA state Indians on the Res indiscriminate killing of Elk.
By the time all these "protected" people get done, nothing will be left
to hunt or fish for..

But It won't be due to me.
Which state you live in may not matter. Well, it seems to matter more to some than to others!
Endangered Species Act is Federal, so they may have national jurisdiction depending on the bird species involved.
Civil penalties for knowingly killing or importing/exporting protected animals for business can be up to $25,000.per violation.
If you didn't know the species was endangered, you could still have to pay $500 per violation
Criminal violations are a bit worse. Fine is up to $50,000, or up to a year in prison, or both.
The Act authorizes rewards for anyone furnishing information of anyone violating the Act. It also authorizes payment to reimburse expenses for the rescue and care of endangered species.
The several district courts of the United States, including the courts enumerated
in section 460 of title 28, United States Code, shall have jurisdiction over any
actions arising under this Act. For the purpose of this Act, American Samoa shall
be included within the judicial district of the District Court of the United States for
the District of Hawaii.
https://www.fws.gov/laws/endangered-species-act/section-11Whether or not it falls under this federal act is up to whether the birds are "Endangered Species" or "Threatened Species" according to their definition. If not, then it would fall to the state.
WA has 12 species of birds on the
Endangered list, 0 species on
the
Threatened list, and 2 on the
Sensitive list.
"Protected" is a general term, so I can't tell which list these birds are on.
Sandhill Crane -
Snowy Plover FT
Upland Sandpiperx -
Marbled Murrelet FT
Tufted Puffin -
Columbian Sharp-tailed Grouse -
Greater Sage-grouse -
Ferruginous Hawk -
Northern Spotted Owl FT
Yellow-billed Cuckoox FT
Streaked Horned Lark FT
Oregon Vesper Sparrow 90d
https://wdfw.wa.gov/sites/default/files/2024-03/wa-state-listed-and-candidate-species-list.pdf5 of the 12 Endangered are also on the federal list for Threatened Species (FT)
and the last says "
USFWS has made a 90-day finding that listing may be warranted (90d)."
With that much overlap, it's 50/50 whether he gets charged in federal court.