What was this Goldeye behaviour? (1 Viewer)

[Gretchen]

I was watching a single goldeye that multiplied to a small group of 5 swimming in the channel to the sea in our local sandflats. They were making frequent quick dives, but as the group grew, I noticed some (maybe just males?) making an interesting movement. One would lift its beak vertically into the air, as though swallowing perhaps? This was repeated frequently as it swam along. I was wondering if this was an eating action or if it was a kind of display or communication. They were pretty far away and I didn't see any sign of food, and it was not all of them doing it; however, it seems like the wrong time of year for breeding related displays. Any idea what I was seeing?

 

[fugl]

It's part of male courtship display which starts about now & generally takes place in small male/female groups.

http://www.birds.cornell.edu/nestinginfo/bios/sp_accts/cogo

 

[Gretchen]

Thanks for that fugl - very helpful! I didn't realize that displays could be starting in the early winter (guess that could be true of other species as well?). Also I hadn't really thought about the fact that these birds might not be migrating, but may actually be on winter grounds now (I'll have to check more ) - which would make more sense for pairing to be starting I guess. I'll also have to look for the females' reciprocal action described here - I didn't notice that.

 

[chris butterworth]

You should see an increase in 'head throwing' from Goldeneye as the winter progresses, as well as from Red-breasted Merganser ( if they are around your neck of the woods ). Something else to keep your eyes open for. :t:

Chris