Pleroma heteromalla
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Mãe-da-Lua
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Aves
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Flora

Maria-cavaleira-de-rabo-enferrujado
Myiarchus tyrannulus
Brown-crested Flycatcher
Família: Tyrannidae

A subespécie local é Myiarchus tyrannulus bahiae.

Maria-cavaleira-de-rabo-enferrujado (Myiarchus tyrannulus)
10/09/2005; Fazenda Canaã, Pentecoste, Ceará, Brasil. Lente 200 mm f2.8.

Figura 1. Identifiquei esta ave como Myiarchus tyrannulus, com base nas margens ferrugíneas das primárias, nas nítidas faixas nas asas, e na cor do bico. Veja a foto em baixo para detalhes da cabeça deste indivíduo.

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Maria-cavaleira-de-rabo-enferrujado (Myiarchus tyrannulus)
10/09/2005; Fazenda Canaã, Pentecoste, Ceará, Brasil. Lente 200 mm f2.8.

Figura 2.

Não há tradução para Português.

Details of head, from Myiarchus tyrannulus shown above. The bill of this bird is dark, with some pink at base of mandible. It is not possible to clearly see whether the pink extends to base of maxilla as well. In any event, the bill is not entirely dark or blackish; this is one of the characteristics that allow to differentiate between the Brown-crested Flycatcher and the (otherwise similar) Short-crested Flycatcher, which has an entirely black bill ( Ridgely and Tudor 1994).

However, there is some interindividual variation in bill color of the Brown-crested Flycatcher, even in the same population (i.e. same locality), and the Brown-crested can also have an all, or nearly all, dark bill. See this example. Thus, a bill with a pink base indicates a Brown-crested, but an all-black bill could belong to either a Brown-crested or a Short-crested Flycatcher.

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Maria-cavaleira-de-rabo-enferrujado (Myiarchus tyrannulus)
05/05/2008; RPPN Mãe-da-Lua, Itapajé, Ceará, Brasil. Lente 200 mm f2.8.

Figura 3.

Não há tradução para o português.

The bill of this individual is nearly entirely black, only the base of the mandible appears a little lighter. Based on the vocalizations, I identified the individual as a Brown-crested. Compare with this photo to see interindividual variability.

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