Unnamed birds 2016

001

D: [g1]-[v5], 2016-03-18. [v5] does not reach as high as usual.

Cannot with reasonable certainty be assigned to a known bird as three named birds produce song that is indistinguishable from this.

002

Possibly the same bird as 025, and possibly also 021.

006

Ka: [k2]-[e1], 2016-06-06.

Bad quality, but seems significantly different from all other songtypes recorded in 2016. Superficially similar to 012, but on closer inspection very likely not the same bird. Probably a single observation of a bird that is not otherwise recorded, but hard to be sure.

008

Songtype C is known from Cornelis, who earlier and later in the season was found not very far from this recording and who was missing for a number of visits. It seems possible, perhaps even likely, that this is Cornelis, but with only one songtype recorded of bad quality, it is hard to be sure. Moreover 021 and 025 also sing C and seem not to be Cornelis.

009

Songtype Q is otherwise known only from Sjoerd, who however on the same day as this recording was recorded on its usual place, quite far from 009. Most likely, this is a single observation of a bird that is not otherwise recorded, but hard to be sure.

010

Fb: [p3]-[f2], 2016-05-11.

Songtype Fb is known from Isaak. On close inspection, however, it seems this is a different bird. This may be the same bird as 036, even though that recording is quite far from 010, but hard to be sure.

012

Ka: [z1]-[e1?], 2016-05-23.

Superficially, both songtypes look similar to those of 006, but on closer inspection, there are significant differences. Most likely, this is a single observation of a bird that is not otherwise recorded, but hard to be sure.

013

?: [q3]-[n3?], 2016-05-23.

Most likely, this is a single observation of a bird that is not otherwise recorded. The second songtype seems to be new, but quality too bad to describe properly. Could possibly still fit a very bad quality Hb or B.2 possibly a somewhat deviant V.

019

Gb: [v5]-[y3], 2016-06-16.

Both songtypes clearly belong to a bird that has been observed only once. It is not clear whether they belong to one bird, or whether each belongs to a different bird.

020

P.2: [z3]-[m3], 2016-06-16.

This version of the songtype P.2 does not seem to fit any other bird. Songtype D could possibly be Evert, if I was mistaken and this is not the same bird as the one singing P.2.

021

?: [h0]&[g2]-[n1], 2016-06-06.

C probably not Cornelis who on the same day was recorded on its usual location, quite far from 021. This could be 025 (which in turn could be 002), even though that is also quite far. Second sonogram recorded only a single time, very strange. It almost seems as if the bird was experimenting.

024

Only one element visible; cannot be identified. This could be Barend but not certain.

025

C: [m1]-[f0], 2016-07-08.

O.2: [k3]-[x3], 2016-07-08.

B.2 does not seem to fit any other bird. Based on C this is possibly the same bird as 021, although that is quite far. Based on O.2 this could be 002.

027

Possibly Dirk who was recorded nearby at the same time. In the field, I was not sure if both songtypes came from the same bird. Since Dirk is not known to sing O, most likely this was another bird.

029

N.1: [j4]-[r3], 2016-07-22.

N.1 would fit Rob very well, who has been recorded the same day very nearby. However, in the background of the same recording, another bird can be heard singing N.1, who is very likely Rob. R would fit Jaap, who has been recorded the same day very nearby, but in this case the fit is not so good. Most likely, this is a new bird, but data are not convincing enough to give it a name. Possibly the same as 038.

031

Order of the elements seems reversed compared to CornelisCornelis, and the song is even lower. Quite possibly a new bird, but data are not convincing enough to give it a name.

032

This seems to fit Evert best, but it is hard to be sure.

036

037

038