April 05, 2015

Display behaviour.

I'm assuming this is a breeding/aggression display by a red breasted merganser.
There were  a number of males chasing each other.
The bird on the left lifted its tail, lowered its stomach and lifted its head.
This was followed by the merganser stretching his neck as long and tall as it could.

Mergus serrator 

source - Cornell Lab of Ornithology.

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