Slender-footed Tyrannulet (Zimmerius gracilipes)

Slender-footed Tyrannulet Zimmerius gracilipes

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Justification

Justification of Red List category
This species has an extremely large range, and hence does not approach the thresholds for Vulnerable under the range size criterion (Extent of Occurrence under 20,000 km² combined with a declining or fluctuating range size, habitat extent/quality, or population size and a small number of locations or severe fragmentation). The population size has not been quantified, but it is not believed to approach the thresholds for Vulnerable under the population size criterion (under 10,000 mature individuals with a continuing decline estimated to be over 10% in ten years or three generations, or with a specified population structure). Despite the fact that the population trend appears to be decreasing, the decline is not believed to be sufficiently rapid to approach the thresholds for Vulnerable under the population trend criterion (over 30% decline over ten years or three generations). For these reasons the species is evaluated as Least Concern.

Population justification
The global population size has not been quantified, but this species is described as 'common' (Stotz et al. 1996).

This species is considered to have a high dependency on forest habitat, and tree cover is estimated to have declined by 3.5% within its mapped range over the past 10 years (Global Forest Watch 2022, using Hansen et al. [2013] data and methods disclosed therein). It is therefore tentatively suspected that this rate of cover loss may have led to a decline of between 1-19% in the species' population size over the same time frame, with a best estimate of reduction being less than 5%.

Trend justification
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Acknowledgements

Text account compilers
Rutherford, C.A.

Recommended citation
BirdLife International (2024) Species factsheet: Slender-footed Tyrannulet Zimmerius gracilipes. Downloaded from https://datazone.birdlife.org/species/factsheet/slender-footed-tyrannulet-zimmerius-gracilipes on 22/11/2024.
Recommended citation for factsheets for more than one species: BirdLife International (2024) IUCN Red List for birds. Downloaded from https://datazone.birdlife.org/species/search on 22/11/2024.