According to Schuchmann 1999a, there are intergrades between baeri and other subspecies of Thalurania furcata, where their ranges meet. If this is so, then the validity of the local subspecies baeri is uncertain.
References:
Hellmayr 1929, p. 392,
Grantsau 1988,
Schuchmann 1999a.
Figure 1. I saw this bird sitting in a bush, at the end of the afternoon, in dim light. It looked entirely black, and I was quite surprised when I first saw its colors on this photo, which was made with a flash-light.
The green throat and the blue breast and belly indicate that this individul is a male. Based only on the above photo, it it not possible to determine the subspecies. A comparison with table 23 in Grantsau 1988 shows that it must be either baeri (Grantsau, fig. 6) or balzani (Grantsau, fig. 4), because of the white crissum and undertail coverts. However, the difference between these two subspecies is the color of the face, which is not visible on the photo. Classification was therefore based on the locality, which lies in the range of baeri (see left column). Admittedly an error-prone approach.
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