EURASIAN STONE-CURLEW

Burhinus oedicnemus
alcaraván común
English: Eurasian Thick-knee.
German: Triel.
French: Oedicnème criard.
Order: Charadriiformes.
Family: Burhinidae.
40-44 cm.
The Stone Curlew cannot be confused with any other species on the Peninsula.
It is not possible to deduce the sex of this species based on its feathers.
It is possible to recognize 3 different ages:

Juvenile specimen: have new feathers without wear and tear. These individuals retain down feathers on their rectrices until September. The lesser coverts are longer and light sandy with a dark central stripe. Conversely, the greater coverts have a wide white band at the tip.

1st to 2nd year specimen: there is a big difference between the molted feathers (greater coverts) and the retained feathers of the juvenile plumage, although there are also cases where the individual has molted all the coverts. The flight feathers are at their highest level of wear and tear.

Adult specimen: usually have a different level of wear and tear on the primaries. On the other hand, the lesser coverts are longer, white and dark-striped at the tip. The greater coverts have a narrow white band with a dark spot at the tip.
Stone Curlew perform a complete post-nuptial molt over a very extensive period between April and October. Some individuals may retain flight feathers during the winter, in which case they would be replaced at the beginning of the next molt (March-April). On the other hand, the molt performed by juvenile individuals is a partial molt that includes body feathers, the central pair of rectrices, and frequently all or part of the lesser and median coverts. This post-juvenile molt usually ends in November.
Primaries: 10 per wing.
Secundaries: 19-21 per wing.
Rectrices: 12.
Link: http://blascozumeta.com/

Medidas/Measures

Adult specimen:
Beak tip to pupil center:53mm
Tarsus: 71mm

Adult specimen

 

1.- Left wing primaries. 2.- Primaries. 3.- Details of the primaries. 4.- Details of P10. 5.- Details of the primaries. 6.- Details of the tip of the primaries (P2, P3, and P4). 7.- Secondaries and tertials. 8.- Secondaries and tertials. 9.- Primaries, secondaries, and tertials. 10.- Details of primaries and secondaries. 11.- Secondaries and tertials. 12.- Details of the outer vane of the secondaries and tertials. 13.- Primaries, secondaries, and tertials. 14.- Primaries, secondaries, and tertials + primary coverts and greater coverts. 15.- Primaries, secondaries, tertials. Primary coverts, secondary coverts (G, M, and L). Alulas. 16.- Details of secondary coverts. 17.- Details of the primary coverts. 18.- Rectrices. 19.- Rectrices. 20.- Rectrices + uppertail coverts. 21.- Details of the rectrices. 22.- Pectoral feathers.

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