Peacock spider
http://www.youtube.com/watch?v=d_yYC5r8xMI
crop circle pufferfish
http://www.youtube.com/watch?v=yaPmYYWsixU
Archer fish
http://www.youtube.com/watch?v=f8oV4RBYR9U
Birds of paradise
http://www.youtube.com/watch?v=YTR21os8gTA
pied babbler (because they're awesome)
http://www.youtube.com/watch?v=sydAjzq4uF4
Cool BBC footage of mating displayshttp://www.bbc.co.uk/nature/adaptations/Courtship_display
Amazing new discoveries
http://www.youtube.com/watch?v=2p9hkWzdBoc
Not a video but a cool species that I have just read about: ambush bugs, Phymata americana
http://www.rakmilphotography.com/Animals/Insects-and-Spiders/Ambush-Bugs-2012