I did a little research on copyright rules and found the Documentary Filmmakers’ Statement of Best Practices in Fair Use from the Center for Social Media at American University.

Our use copyrighted material (i.e. clips from the movies "Antz", "Them!" and "Honey, I Shrunk the Kids) would fit nicely into Category #2: Quoting copyrighted works of popular culture to illustrate an argument or point. There is no concrete time limit for the use of these clips, but they must be properly identified. I envision us using these clips to illustrate human/ant interaction.

I am going to start collecting some movies that we could use as B-roll. Forward me any other suggestions for movies feature ants.