http://youtu.be/9pdmkckANH4 It's just a pile of sand--no wait, is that a tentacle wriggling in the corner? These time-lapse videos taken by researchers at the University of Queensland show that mushroom corals unearth themselves by slowly inflating and then deflating over 10 to 20 hours. See a second coral attempt the same after the jump. http://youtu.be/Pu0d101sMIk