A combination of real and rubber locusts were used when Frank and Hidalgo take cover under a blanket, and the horde of insects that eventually blackens the entire screen was computer generated.
When the swarm abated, a combination of rubber and specially-made edible locusts were placed around the set, and both actor and horse knew which ones to eat.
This prop was used on screen as set dressing too. It is molded in rubber and measures about two inches in length.
* COA: Movie Prop Warehouse.
