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<a target="_blank" href="https://jesperbayjacobsen.com/page_start.php?file=bview&id=174&search=samebird&speciesid=6624" >More documentation here.</a> |
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Common Chiffchaff (Same bird)
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5787
(5 photos)
Common Chiffchaff (Phylloscopus collybita abietinus?) Same bird: 174 Gransanger ~ Mosquitero Común ~ Gransångare 2024-04-15 Kalvebod Fælled, Denmark
Pumpehus-broen og langs materielgården. Bird 3. Third bird suspected to be a Siberian chiffchaff -tristis. The sharp call made me suspect that. But spectrograms deviated constantly from a classic tristis, and after some research I'm now pretty sure all of these sharp-calling birds that we see during these days are of the northern subspecies. Perhaps the birds come from the eastern part of the range, close to where tristis belong, since there is a slight similarity to the quality of the call the two between. |
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5791
(1 photos)
(1 sounds)
Common Chiffchaff (Phylloscopus collybita abietinus?) Same bird: 174 Gransanger ~ Mosquitero Común ~ Gransångare 2024-04-16 Kalvebod Fælled, Denmark
Pumpehus-broen og langs materielgården. Originally suspected to be a tristis. Bird 3. As with the other bird, 5788+5790, this one was also still present today, third day. Inverted u-spectrogram, 4-5+ Khz, and constantly calling with this call according to xenocanto goes well with abietinus. Tristis shows a spectrogram flatter at the beginning and falling toward the end, and lower hertz. Initially, listening to the calls in the field, however, I was not able to detect much difference, and I have to admit that I was surprised to see that my spectrograms show this u-shape, since I hear it as a flat linear sound. One might speculate whether these birds come from a part close to the tristis population in northern Siberia, the contact zone where voices during learning are influenced by different sound pools. |
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5792
(7 photos)
(2 sounds)
Common Chiffchaff (Phylloscopus collybita abietinus?) Same bird: 174 Gransanger ~ Mosquitero Común ~ Gransångare 2024-04-17 Kalvebod Fælled, Denmark
Pumpehus-broen, Hejresøen. Originally thought to be a tristis. Bird 3. Fourth day. Still calling exclusively with the same call, but today it included a few chatter notes (in first sound clip) similar to the ones often heard at the beginning of the chiffchaff song. But it never got into singing. Perhaps it is a female. And perhaps it is a young bird, because today it started to flutter its wings several times, as a begging juvenile would. However, I've seen especially magpies do the same now in spring, and one shouldn't think it had anything to do with food begging but rather a behavior related to breeding, pair matching. But the bird continues not to be interacting with other phylloscopuses, though many are present. I tried to provoke it with song of both collybita chiffchaffs and tristis, but no response. Actually when I tried with Iberian Chiffchaff it seemed to be more interested, but without going crazy. The call is somewhat similar to what the Iberian has, but comparing the spectrograms they are very different. Interestingly, in photos 1 and 2 a yellow alula and underwing coverts are seen, and I think I have read that it can be a crucial character for identifying tristis - which should not have any yellow - hence all good for abienitus. Notice: the first spectrogram shows a fraction with chatter and the call. |
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5806
(1 photos)
(1 sounds)
Common Chiffchaff (Phylloscopus collybita abietinus?) Same bird: 174 Gransanger ~ Mosquitero Común ~ Gransångare 2024-04-19 Kalvebod Fælled, Denmark
Pumpehus-broen, Hejresøen. Originally thought to be a tristis. Bird 3. Sixth day. Same behavior. Notice the different appearance of the spectrogram compared to April 16, but this is caused by different time scales. |
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5827
(9 photos)
(1 sounds)
Common Chiffchaff (Phylloscopus collybita abietinus?) Same bird: 174 Gransanger ~ Mosquitero Común ~ Gransångare 2024-04-24 Kalvebod Fælled, Denmark
Pumpehus-broen, Hejresøen. Originally thought to be a tristis. Bird 3. 11th day. Same behavior, but silent when I arrived. Later showed up on top of the vegetated soil barrier surrounding the maintenance installations on the other side. But basically the same area as always. It kept calling while foraging and showed nicely. |
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5838
(8 photos)
(2 sounds)
Common Chiffchaff (Phylloscopus collybita abietinus?) Same bird: 174 Gransanger ~ Mosquitero Común ~ Gransångare 2024-04-29 Kalvebod Fælled, Denmark
♀. Pumpehus-broen, Hejresøen. Originally thought to be a tristis. Bird 3. 16th day. The bird has been silent for a few days, why I thought it had left. As goes for all the abietinus candidates that I'm investigating these days, it seems to have lost part of the spirit, calling for shorter intervals. I guess it's a brood patch you can see in the first photos, why the bird is a female, something I've suspected all the time by the behavior. But if it is in breeding mood, it is interesting why all the willow warblers and chiffchaffs that are constantly active around it don't seem to be interesting. Perhaps she is still waiting for a true male of her own kind to arrive, or perhaps she is that different that she simply doesn't recognize the others as potential mates...sound of today to be added. Also rec 1: common chiffchaff, willow warbler, airplane. |
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5854
(1 photos)
(1 sounds)
Common Chiffchaff (Phylloscopus collybita abietinus?) Same bird: 174 Gransanger ~ Mosquitero Común ~ Gransångare 2024-05-08 Kalvebod Fælled, Denmark
♀. Pumpehus-broen, Hejresøen. Originally thought to be a tristis. Bird 3. 25th day. Also rec 1: Common Chaffinch, Garden Warbler. |