Hosted by "Survivorman's" Les Stroud, Shark Week's 20th Anniversary will fill Discovery Channel's total day schedule now through Saturday, August 4, from 9 AM to 3 AM (ET/PT) each day - adding up to over 130 hours of shark programs devoted to the behavior of one of the most mysterious and majestic creatures on the planet.

Also to be featured is a programmed-by-you Viewer's Choice hour at 8 PM, and eight all-new primetime specials at 9 PM.

Check out some clips from YouTube:

Shark Week – Tiger Shark Destroys Turtle: http://www.youtube.com/watch?v=oqm-UHmpxA4

Shark Week – Scary Shark Attack: http://www.youtube.com/watch?v=gOn9qeTXJ1k

Win a Shark Week DVD pack!