File:Anas wyvilliana? or Anas wyvilliana x A. platyrhynchos? (6246662909).jpg
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[edit]DescriptionAnas wyvilliana? or Anas wyvilliana x A. platyrhynchos? (6246662909).jpg |
This trio of ducks has me somewhat baffled. They flew in one day and were gone by the day's end. These ducks have so many traits of the endemic Hawaiian duck or koloa maoli (Anas wyvilliana): they are all small birds; overall mottled pattern; did not quack (koloa maoli quack less or softer than mallards), among other slight traits. But, when I see "koloa maoli" near sea level on Oʻahu, I really have my suspicions that the bird(s) may be a hybrid with a feral mallard (Anas platyrhynchos), which they frequently mate with. Koloa maoli (Anas wyvilliana) is endemic and an endangered species in the main Hawaiian Islands; whereas the mallard is not and very common. Hybridization is a major problem with the feral mallards. These ducks were seen in Waimea Valley, Oʻahu (Man-made Pond #3) swimming amongst introduced waterlilies, Victoria sp., and native ʻakaʻakai (Schoenoplectus tabernaemontani). Here seen with ʻAlae ʻula or Hawaiian moorhen (Gallinula chloropus sandvicensis). Both birds are endangered species endemic to the Hawaiian Islands. |
Date | |
Source | Anas wyvilliana? or Anas wyvilliana x A. platyrhynchos? |
Author | David Eickhoff from Pearl City, Hawaii, USA |
Camera location | 21° 38′ 14.97″ N, 158° 03′ 25.94″ W ![]() | View this and other nearby images on: OpenStreetMap | ![]() |
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This image, originally posted to Flickr, was reviewed on 15 November 2012 by the administrator or reviewer File Upload Bot (Magnus Manske), who confirmed that it was available on Flickr under the stated license on that date. |
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current | 06:00, 15 November 2012 | ![]() | 2,033 × 1,404 (479 KB) | File Upload Bot (Magnus Manske) (talk | contribs) | Transferred from Flickr by User:Tim1357 |
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot G3 |
Exposure time | 1/60 sec (0.016666666666667) |
F-number | f/3 |
Date and time of data generation | 20:08, 24 January 2008 |
Lens focal length | 28.8 mm |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | picnik.com |
File change date and time | 20:08, 24 January 2008 |
Y and C positioning | Centered |
Exif version | 2.2 |
Date and time of digitizing | 20:08, 24 January 2008 |
Meaning of each component |
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APEX shutter speed | 5.9068905902692 |
APEX aperture | 3.1699249969261 |
APEX exposure bias | 0 |
Maximum land aperture | 3.1699249969261 APEX (f/3) |
Metering mode | Pattern |
Flash | Flash fired, auto mode, red-eye reduction mode |
Supported Flashpix version | 1 |
Color space | sRGB |
Focal plane X resolution | 8,114.2857142857 |
Focal plane Y resolution | 8,114.2857142857 |
Focal plane resolution unit | inches |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Scene capture type | Standard |