Parental behavior at a nest of the Southern Beardless Tyrannulet (Camptostoma obsoletum)


Here, I present the first quantitative data on parental behavior in a nest of the Southern Beardless Tyrannulet Camptostoma obsoletum (Temminck, 1824) in southeast Brazil. The nest was in a bromeliad (Tillandsia tricholepis) 1.93 m above ground. Eggs were laid in alternate days, measured 1.71 × 1.18 mm and 1.60 × 1.16 mm, and weighed 1.2 and 1.0 g, respectively. Eggshell had a whitish background and small light brown blotches near the blunt pole. Mean nest attentiveness was 87.5% and decreased across the incubation period. The eggs hatched with 16 and 17 days of incubation. In the nestling period, parents made 8.89 ± 3.52 provisioning trips/h (range: 5–17), which lasted on average 7.5 ± 5.69 s (range: 1–30 s). Provisioning trip rate increased with nestling age, whereas visit duration decreased. Nestlings fledged asynchronously, 16 days after hatching, relatively well feathered. Although based on a single nest, the data suggest that C. obsoletum presents an uncommonly high nest attentiveness compared to closely related species and Neotropical birds in general.

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Fig. 1
Fig. 2

Data availability

Data supporting this study was available upon request from author.


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I thank Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) for a doctoral fellowship and M. A. Pizo and H. Sarmento for their valuable suggestions on the first draft.

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Correspondence to Augusto Florisvaldo Batisteli.

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Communicated by Eduardo Santos

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Batisteli, A.F. Parental behavior at a nest of the Southern Beardless Tyrannulet (Camptostoma obsoletum). Ornithol. Res. 28, 216–220 (2020).

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  • Breeding biology
  • Elaeniinae
  • Incubation
  • Nest attentiveness
  • Nesting behavior
  • Tyrannidae