Cicada killer wasps use visual boundaries to define their territory because it makes their territory easier to defend.

cicada killer sphecius speciosus

Video source: Ken Gibson

Source: Eason, P., Cobbs, G., & Trinca, K. (1999). The use of landmarks to define territorial boundaries. Animal Behaviour, 58(1), 85-91. http://dx.doi.org/10.1006/anbe.1999.1133

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