The winners of the Nikon Small World in Motion video competition were announced (the photo competition winners can be found here):
1st place:
Emerging Acropora muricata (staghorn coral) polyp (coral tissue in green; algae in magenta) by Dr. Philippe P. Laissue
2nd place:
Vampyrophrya (parasite) tomites swimming rapidly around within the body of the dead copepod host by Dr. Richard R. Kirby
3rd place:
Stylonychia (microorganism) creating a water vortex using its cilia by Tommy Gunn and Jesse Gunn
4th place:
Two freshwater tardigrades feeding on another tardigrade by Dr. Hunter N. Hines
5th place:
Developing mouse embryo, showing the progression of neural tube folding and closure by Dr. Kate McDole and Dr. Philipp Keller
Source: Nikon, via DIYphotography