Compare Joel 2:7-8; the most striking fact in the flight of the locust-swarms was their apparent order and discipline, sweeping over the land like the invasion of a great army.
Matthew Henry
Concise Bible Commentary
Four things that are little, are yet to be admired. There are those who are poor in the world, and of small account, yet wise for their souls and another world.
SDA Bible Commentary (limited)
Volume 1-7
27. Locusts. These show no sign of having leaders, yet they move with the synchronism of a well-trained army.