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Species Guide

Guianan Tyrannulet

Zimmerius acer

The Guianan tyrannulet, known scientifically as Zimmerius acer, is a diminutive and agile bird belonging to the Tyrannidae family, which encompasses the tyrant flycatchers. This species, once considered a mere subspecies of the slender-footed tyrannulet, has now been recognized as a distinct entity, flitting through the forest canopies with its own unique flair.

Identification Tips

When endeavoring to identify the Guianan tyrannulet, one should note its modest size and the subtle yet distinctive plumage patterns that adorn its feathers. Observers should also pay close attention to its vocalizations, which have proven to be a more reliable indicator of its taxonomic classification than plumage alone.


The Guianan tyrannulet is a denizen of the forests, where it can be seen darting among the foliage in the eastern reaches of the Amazon Basin and the northeastern expanses of Brazil.


This species has carved out a home for itself within the lush, verdant confines of the Amazon rainforest, as well as the Caatinga and the Guianas, where it goes about its daily existence largely unnoticed by the casual observer.


The Guianan tyrannulet exhibits the typical behavior of its family, actively foraging and displaying a remarkable agility that belies its small stature.

Conservation status

The IUCN Red List has classified the Guianan tyrannulet as a species of Least Concern, indicating that, for the moment, it does not face any immediate threats to its survival. However, one must remain vigilant, as the stability of any species is subject to the ever-changing dynamics of its environment.

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Guianan Tyrannulets on Birda

A map showing the sighting location
Eric DeFonso
31 Oct 2011 - 12:00am

More Tyrant Flycatchers, Calyptura

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