Why do wagtails wag their tails? ll Grey wagtail ll

There are various possibilities: it could help them:

Find more food – wagging your tail could disturb the sort of insects you eat and therefore be a good foraging strategy.

Avoid predators – wagging your tail could show potential predators that you are alert and they should not waste their energy trying to catch you. It’s a, “Don’t even bother trying, I can see you.” signal.

Improve camouflage – wagging your tail breaks up a still outline and might help you be camouflaged better against a moving backdrop of streams and running water
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