Order
Passeriformes
Family
Thamnophilidae
Genus
Myrmotherula
 
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Version 1.0

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 - Leaden Antwren
 - Leaden Antwren
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Leaden Antwren Myrmotherula assimilis

Thomas S. Schulenberg and Gary H. Rosenberg
Version: 1.0 — Published June 30, 2011

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Introduction

The Leaden Antwren is a small slaty-gray member of the genus Myrmotherula that is mainly restricted to the understory of older, established river-islands along the Amazon River and its larger tributaries, from northeastern Peru east to central Brazil. This is the only species of gray antwren found on Amazonian river-islands. Males are entirely light slaty-gray with white tips to the wing coverts, forming two distinct wingbars. Females are light buff below, gray above, and also have two faint white wingbars. Both sexes have a concealed white interscapular patch that is flashed when the bird is agitated. Leaden Antwrens are found in isolated pairs in the understory of taller, seasonally flooded forest, particularly where there are dense stands of Heleconia. It is most similar to the Gray Antwren (Myrmotherula menetriesii), but that species is associated with mixed-species flocks in terra firme and transitional forest, and is unlikely to co-occur with Leaden. Songs are also very different between these two species. The primary song of Leaden has a rapid descending trill “te-te-te-tu-tututututrrrrr,” speeding up into almost a dry rattle at the end. The song of Gray Antwren is a series of high-pitched clear whistles, a “seeee-seeee-seeee-seeee-seeee.”

Distribution of the Leaden Antwren - Range Map
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  • Year-round
  • Migration
  • Breeding
  • Non-Breeding
Distribution of the Leaden Antwren

Recommended Citation

Schulenberg, T. S. and G. H. Rosenberg (2011). Leaden Antwren (Myrmotherula assimilis), version 1.0. In Neotropical Birds Online (T. S. Schulenberg, Editor). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/nb.leaant1.01