One of my favorite scenes of the BBC Life Documentary shows the Capuchin Monkeys of Boa Vista, Brazil using stones as tools to crack open a nut.
Also:Nut-cracking monkeys find the right tool for the job (New Scientist Article)
I love the Blue Planet, Planet Earth and Life documentaries. Enjoyable study/work breaks.
Deep sea stuff is crazy too and at least directly related to what I am studying.