Phoenicurus ochruros – Καρβουνιάρης – Black Redstart

An immature or female Phoenicurus ochruros, very common winter visitor.
It shares the habit of constantly vibrating its tail, with several other species like wagtails (motacilla genre) and Actitis hypoleucos (Common sandpiper). A possible reason of this habit is to become unseen while foraging beside a stream. Are there any other possible evolutionary explanations ?

Rema Pikrodafnis 21/10.

~ by Sterna hirundo on 27/10/2008.

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