At Sunday 16th May was observed and documented an unusual bird individual behavior that started at 7:00 a.m. The spontanic registration is extended now over the following day.
The bullfinch´s behavior consisted in repeated short flights from a wild-rose-bush-branch towards a window over a distance of about 25 cms and beak-throbbing against a window screen.
When opened the window the bird remained throbbing exactly the same window glass sectors but didn´t enter into the room. Also a "sitting in front of the glass and dancing with his mirror image"-behavior was observed and interpreted as erroneous mating-ceremony. Bullfinch females are grey-black coloured meanwhile males are strongly visible red. In a normal mating behaviour the bird would have recognized the colour difference. The behaviour was described so with a humanizing term as "Narcism".
Remarkable furthermore is, that the photographer can approach to the bird sitting at the window from behind the screen until distance is nearly zero, even if the bird registeres the movement inside the room. Approaching from the side when window is open without glass barreer is not possible at a distance lower than 1.5 meters. Then the bird reacts with escape reaction.
The uncommon bird behavior lasted until 21:00 p.m. also during a time period, when inside the room light was switched on and the window-glas-mirror effect due to the room illumination must have been reduced. At Monday 5:30 a.m. the bird that rested over night darkness returned to the same branch and window screen corners. It´s throbbing last now until noon.
At the same window of the CID Institute a similar single bird behaviour was observed and registered about 4-5 years ago. The glass-throbbing bird was then an Aegithalos caudatus.
About 2013 during winter month and snowfall a similar single bird behaviour of a blue-tit was registered at the terrace window of the CID Institutes guest-room. The bird also repeatedly sprang inside the snow with extended wings an produced by that way body shilouette imprints inside the snow.
Also in it´s second day of appearance, the uncommon bird behavior lasted until 9:00 p.m. and started the third day again about 5:30 a.m.
Between 9:00 a.m. and 13:00 p.m. the window was closed experimentally with an outside curtain to see if this interruption at it´s phenomenon site would drive away the bird and stop his behaviour. After lifting the curtain 4 hours later the bird returned inmediately and started again with it´s short flights against the upper right glass screen corner.
Aberrant bird behaviour pattern at it´s third day
18 May 2021
The literature mentions similar or same behaviour patterns as "Kamikaze"- or "Mirror-Fencer"-behaviour, in english "Shadow-Boxing". Finches that fly repeatedly and monotous during hours and days always against the same window screen are understood as attacking there their own mirror image. Erroneously they register their mirror as enemy or competitant in it´s nesting or breeding area and attack them.
EARLIER REGISTRATIONS
In 2016 at the same window a rather similar behaviour of an Tail Tit (Aegithalos caudatus) was observed and registered during less one week from 5th until 9th of March. During the first days the bird started from different branches of the rose bush to fly against different window sectors so as if it would search a passage inside the mirror screen landscape for nesting purposes. Later it rammed continuously the window screen only in the same sector as the bullfinch´s behaviour is recorded in May 2021.
Aegithalos caudatus at the rosebush-window of CID Institute Office at 6th March 2016
3 years earlier, in March 2013, at a different window of CID Institute´s Guest Room a similar "flying to and knocking at window screen"-behaviour was registered during the days 3rd until 14th March. That time the bird was a Blue Tit (Parus caeruleus). The Blue Tit´s flight mostly started from a window-near branch of an Rhus typhina bush where it also returned to after knocking at the window screen.
Blue Tit window-throbbing during March 2013
After snowfall and several days snow cover persistence on the terrace in front of the window, bird´s body imprints with extended wing shilouettes have been found on the ground. It is rather probable that the same bird after "attacking" the bird´s own mirror in the window screen started to spring inside the deep snow like dancing.
Bird body imprints in snow in front of the upside described window at 14 March 2013
Actualized : 18th May 2021 - 17:30
Peter Zanger / Foto CID
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