Porphyrio porphyrio
English: Purple Swamphen.
German: Purpurhuhn.
French: Talève sultane.
Order: Gruiformes.
Family: Rallidae.
45-50 cm.
It is not possible to confuse the Purple Swamphen with any other species in the Iberian Peninsula. Its size and blue-colored plumage make it unmistakable.
The plumage is very similar in both sexes, so it is not a variable to consider in this process.
It is possible to recognize 3 different ages:

Juvenile specimen: they have a dark grey back and the rest of the upper parts (nape) and wing coverts are a faded blue-violet color. The chin is a dirty white color, the sides (flanks) are gray. The beak has a faded red color in the early stages, gradually turning into a bright red with a dark area on the sides. The legs are a faded red-ochre color.

1st/2nd-year specimen: these individuals have a plumage quite close to that of adults. It is possible to differentiate them by the head and upper parts, which are dyed a slightly faded blue-violet color. The chest and lower parts mix gray with white. The primary and secondaries are from the previous generation (retained), so they will be more worn than in adults. The 1st/2nd-year specimens have white undertail coverts, like adults, but in this case, the tips are stained with some strands of dark brown color.

Adult specimen: in this case, the back is already completely blue-violet. The rest of the upper parts, such as the nape, and wing coverts are pure blue-violet. The chin is cobalt blue. The beak and legs are a bright red color.
Purple Swamphen perform a complete post-nuptial molt, which usually ends in September. The post-juvenile molt, on the other hand, is partial and ends between the end of September and the beginning of October. In this process, body feathers are changed. Both age types perform a pre-nuptial molt in which only body feathers are changed.
Primaries: 10 per wing.
Secundaries: 13 per wing.
Rectrices: 12.
Link: http://blascozumeta.com/


Adult specimen:
Beak tip to pupil center: 55mm
Tarsus: 107mm

1st/2nd year specimen


1.- Primaries of the left wing. 2.- Primaries. 3.- Detail of the outer vane of the primaries. 4.- Details of the primaries. 5.- Details of the primaries. 6.- Secondaries S1-S6. 7.- Secondaries S7-S13. 8.- Secondaries and tertials. 9.- Details of the secondaries. 10.- Detail of the tertials. 11.- Primaries, secondaries and tertials. 12.- Details of P10. 13.- Primaries, secondaries and tertials. 14.- Primaries, secondaries and tertials + primary coverts and greater coverts. 15.- Details of the primary coverts. 16.- Details of the greater coverts. 17.- Primaries, secondaries, tertials. Primary coverts, secondary coverts (G, M, and L). Alulas. 18.- Greater, median and lesser coverts. 19.- Details of the frayed tip of the greater coverts. 20.- Details of the frayed tip of the median coverts. 21.- Pectoral feather. 22.- Rectrices. 23.- Rectrices.

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