Here is a great new YouTube Video to use in your instruction. It is called Underwater astonishments - David Gallo. View full lesson: http://ed.ted.com/lessons/underwater-astonishments-david-gallo
David Gallo shows jaw-dropping footage of amazing sea creatures, including a color-shifting cuttlefish, a perfectly camouflaged octopus, and a Times Square's worth of neon light displays from fish who live in the blackest depths of the ocean.
Talk by David Gallo.<br><br> via YouTube http://www.youtube.com/watch?v=-Hi5muM44NE
via Personal Recipe 2589760: http://ifttt.com/myrecipes/personal/2589760