It's like I said, opinions differ. But I do know that some have documented to the contrary of your observations Lester. And there have been observations of apparent aggression between solare and cornutum. I have also witnessed an increase in head bobbing frequency along with apparent rise in stress and movements of one horned lizard, when another approaches to also feed on the same location.

I did not say that the behavior was aggressive. And any "communication" cannot be systematically refuted as being non-territorial in nature. I don't think any of us can say with certainty what exactly is being communicated. "My territory" would be a communication as well. They could be communicating "hey, there's some ants here!" too. Nor could one say with certaity that a single horned lizard does not bob it's head for territorial reasons when it appears to be alone, to be seen by unseen horned lizards.
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"A man that should call everything by it's right name, would hardly pass the streets without being knocked down as a common enemy." The Complete Works of George Savile, First Marquess of Halifax 1912,246

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