(1954) Charlton Heston "The Naked Jungle". The ants were pretty clever. They would cut broadleaf leaves off bushes on shore and transport the leaf down to the water and "launch" the leaf. Then
many ants would "board" the leaf and off they went across the water filled ditch that Heston dug around the plantation house to protect it. These ants would actually attack and eat a Large person in a matter of hours.
A short review of the movie:
http://www.rateitall.com/i-941575-na...leiningen.aspx