The New York Times reported
When territorial animals are confronted by intruders, they instinctively protect their turf — no matter how small.For warty birch caterpillars, that means patrolling one of the tiniest territories on Earth: the tips of birch leaves. Scientists observed the caterpillars warding off intruders with loud vibrations that advertise they are in command of a domain that stretches a few millimeters across.
Read more and see video at The Very Territorial Caterpillar
Natural History Wanderings 
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