piolhinho-do-grotão vs alegrinho-balança-rabo

Reiser's Tyrannulet and Greater Wagtail-Tyrant can be distinguished primarily by their structure and behavior. Reiser's Tyrannulet is a Phyllomyias, typically more compact and less elongated than the Greater Wagtail-Tyrant, which has a more pronounced tail and wagtail-like behavior.

1. Structure: Look for the more compact body of Reiser's Tyrannulet versus the elongated form of Greater Wagtail-Tyrant. 2. Tail Behavior: Observe the tail movement; Greater Wagtail-Tyrant often flicks its tail, unlike Reiser's Tyrannulet.

Reiser's Tyrannulet is generally more compact, while Greater Wagtail-Tyrant appears more elongated due to its longer tail.

Greater Wagtail-Tyrant displays wagtail-like behavior, often flicking its tail, which is not typical for Reiser's Tyrannulet.