What does Proverbs 30:27 mean?

The world typically thinks small or unimportant things are irrelevant. Agur (Proverbs 30:1) has been noting several counterexamples. Each is humble, in its own way, yet achieves something impressive (Proverbs 30:24). This corelates with the idea that God can use things dismissed by the world to further His will (1 Corinthians 1:27–28). Tiny ants gather food and survive from generation to generation. Hyraxes live in the cliffs and rocks humans run to for shelter.

Now, the given example is the locust. A locust swarm has no meaningful leadership. There is no leading them, yet they can advance and "conquer" lands as a unified army. When humans organize to march in lines, the space between each man is closed. A horde of locusts also moves shoulder-to-shoulder, or so it seems. In the ancient world, military tactics greatly relied on men moving as a single unit. The locust swarm's devastation is the ultimate example of a single "unit" made powerful by the combined action of many members.

Locusts are also mentioned by the prophet Joel (Joel 1:4). He describes the locusts coming in waves, utterly destroying the crops. He describes a swarm so massive that it blocks out the sun (Joel 2:2, 10). That same passage compares the movement of the locusts to that of a well-organized army (Joel 2:4–5). God used the destructive power of locusts as one of the plagues against Egypt (Exodus 10:3–6). Revelation 9:7–11 compares a certain type of demonic being to locusts.