High-resolution photographic source textures (original photographs; feather regions selected through model UV coordinates):

Bald Eagle in Flight, Steve Hillebrand / USFWS, public domain
https://commons.wikimedia.org/wiki/File:Haliaeetus_leucocephalus-flight-USFWS.jpg

Red Tailed Hawk, Dana Shellhorn / USFWS, public domain
https://commons.wikimedia.org/wiki/File:Red_Tailed_Hawk_(50130830373).jpg

Audio, CC0 1.0:
Bald Eagle.wav, CCCanary, recorded by Marylou Blakeslee in Glacier Bay, Alaska
https://freesound.org/people/CCCanary/sounds/350753/
red-tailed-hawk-flying-away.wav, 1888software
https://freesound.org/people/1888software/sounds/575525/
Edits: mono conversion, loudness normalization, MP3 encoding from publisher HQ previews.