This Long-billed Gnatwren (Ramphocaenus melanurus) sings at the top of the Mirador Trail in Manuel Antonio (Costa Rica). Here are two more examples of the call with slight variations.
This is an example of a Long-billed Gnatwren (Ramphocaenus melanurus) recorded on the road leading out of Bribri, near Puerto Viejo de Talamanca (Costa Rica), 6/22/99.