Longtail Tyrant
Birds of Panama - large bird photo gallery
The Long-tailed Tyrant (Colonia colonus) is found in Argentina, Bolivia, Brazil, Colombia, Costa Rica, Ecuador, French Guiana, Guyana, Honduras, Nicaragua, Panama, Paraguay, Peru, Suriname, and Venezuela. For more details from Wikipedia about the Longtail Tyrant please see this page here.
These Longtail Tyrant images where taken in Altos del Maria.