Tufted duck (Aythya fuligula)

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ad. male

#9907
Gulf of Gdańsk Województwo pomorskie, Poland

#11853
Jastarnia Województwo pomorskie, Poland
29.01.2024

	number	longest
primary	10 per wing	139.0 - 156.0mm n=6 P₉ (83%) P₈ (17%)
secondary	18 per wing	101.0 - 125.5mm n=4 S₁₄ (75%) S₁₃ (25%)
retrix	14	66.0 - 71.5mm n=3 R₂ (33%) R₄ (33%) R₁ (33%)

wing length¹

hand-wing-index^1,2 (HWI)

primaries-index

wing length/longest primary ratio

hand-wing-index/primaries-index ratio

190 - 204mm n=18

43 - 53% n=12

39 - 42% n=5

⌀136%

no data available

detailed information

The wing length is measured on the flattened and straightened wing ("maximum chord") from the carpal joint to the tip of the longest primary feather, the so-called "Kleinschmidt-method".

combined data from:
Avonet¹: 190 - 204mm n=16
Featherbase: 192 - 194mm n=2

The hand-wing-index, introduced by Kipp 1959, is calculated as the ratio of the hand length (difference between the length of the longest primary and the first secondary) to the wing length.

combined data from:
Avonet¹: 43 - 53% n=12,

The primaries-index is calculated as the ratio of the longest primary feather length to the first (outermost) secondary. It is the equivalent of the hand-wing index for feather measurements.

The wing length/longest primary ratio is calculated as the ratio of the wing length to the length of the longest primary feather.

The hand-wing-index/primaries-index ratio is calculated as the ratio of the hand-wing index to the primaries-index.

¹ Tobias, J. A., et al. (2022). AVONET: morphological, ecological and geographical data for all birds.
² Kipp, Friedrich A.: "Der Handflügel-Index als flugbiologisches Maß", erschienen in "Vogelwarte - Zeitschrift für Vogelkunde", 1959, Band 20, Heft 1

male

#1977
Wien, XXII., Neue Donau
15.01.1991