What does it mean?

Found this diagram in some library book.

Re: “termite castle” culture – Swarms of termites build castle-like structures without supervision or a centralized plan. Working independently without communication or a leader, they proceed using environmental cues.

Back in 2012, as we drove south on the Mulligan Hwy in Australia and got down on the valley floor, we must have passed thousands of little termite castles.

Unfortunately, my environmental cues were not strong enough to make me stop the car and take a picture of any of those many interesting insect homes. Not one closeup photo; sad.

Mulligan Highway
Everlasting Impressions of Australia
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