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Tail Wagging
This robin was upset. A predator was in his territory and trying to approach the nest. He communicated his agitation through a behavior called tail wagging. He lifted and lowered his tail feathers while making Peek and Tut calls. Notice when the tail feathers go up, the wings get lowered. This posture — along with the robin's raised head feathers — showed he was ready to chase away the danger. He avoided a battle because the trespasser heeded the warning and left.
Robin: Lifting Tail Feathers
Laura Erickson