BIRDS OF COSTA RICA

PHOTO LIBRARY

Long-billed Gnatwren / Soterillo Picudo (Ramphocaenus melanurus)

Ageing and sexing overview:

Spring:

AHY - U
Sexes identical; characteristics indicating age unknown.  

Ageing and sexing details:

SPRING:  AHY-U (after-hatch-year, sex unknown)

Male and female plumages are identical, and overall differences in plumage between SY and ASY Long-billed Gnatwrens is subtle.


Photo by Marcel Gahbauer, Las Caletas (CR), April 2008


The wing may provide information to help separate SY and ASY Long-billed Gnatwrens, but more study is required on the extent and timing of moult in this species.


Photo by Marcel Gahbauer, Las Caletas (CR), April 2008


The rectrices may also provide a clue to the age of Long-billed Gnatwrens, but further study is required.


Photo by Marcel Gahbauer, Las Caletas (CR), April 2008

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2002- The Migration Research Foundation Inc.