I was observing Black-headed Gulls in a breeding colony today where I witnessed another rare occurrence of adult Black-headed Gulls involved in a fierce fight.
The following video is almost 4 minutes long but the fight itself had by then gone on for some time.
With all the commotion that is going on it is difficult to see if these are 2 males fighting over a female or 2 females fighting over a male. You would expect it to be 2 males but what is interesting is that both partners seem to be involved in the fight.
Each time the intruder is chased away, the pair approach each other and confirm their bond by a display of forward postures, oblique postures, head-flagging and some choking.
Scenes from last year
From 02:17, the intruder is pinned down and seemingly unable to do anything other than to wait it out. This is very much the same scene that I observed in the only other observation of such a fight, namely in June 2012 (see Rare Rage and Rare Rage Update). Here is the video of that moment:
It is still very unusual for me to see Black-headed Gulls display this type of behavior.