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Audio
MP3 audio files can be played on most desktop-based digital audio players (e.g., Windows Media Player or iTunes) and portable media devices. 
The Destination, the Journey and the Katmai 3-Step (.mp3, 8.71 MB, 19:02)
Bear Jam on the Corner (.mp3, 5.29 MB, 11:33)

Video
MP4 and MOV video files can be viewed with QuickTime Player, available for free download here. QuickTime Player is also a standard feature of iTunes—if you have installed iTunes on your computer, you probably already have QuickTime Player. 
Katmai (NPS park film from 1979) (.mp4, 27.8 MB, 15:19)
The Forge of Vulcan (1979) (.mp4, 31.7 MB, 18:20)
Letting Go: The Art of Catch & Release (2005) (.mp4, 25.8 MB, 8:43)
Wolf Fishing for Salmon at Brooks Falls (July 8, 2007) (.mov, 11.4 MB, 0:43)