page_title: Blue-winged goose
section_title: Relations
hierarchical_section_title: Blue-winged goose / Relations
caption_attribution_description: Cyanochen cyanoptera English: A Blue-winged Goose at Maryland Zoo, Baltimore, Maryland, USA. This bird was taking a drink at the penguin exhibit.
context_page_description: The blue-winged goose is a waterfowl species which is endemic to Ethiopia. It is the only member of the genus Cyanochen.
context_section_description: The relations of this species among the waterfowl is unresolved. It is morphologically close to shelducks, and particularly the South American sheldgeese, which have highly similar courtship displays. However, mitochondrial DNA sequence analyses of the cytochrome b and NADH dehydrogenase subunit 2 genes indicates that it might belong to a very distinct and ancient "duck" clade, together with Hartlaub's duck, another African species of uncertain affinities. The wing color pattern, a good morphological indicator of evolutionary relationships in waterfowl, is similar in these two species, and very different from any other waterfowl.
caption: At Baltimore Zoo having a drink of water
exif: {"Image Make": "Canon", "Image Model": "Canon PowerShot S1 IS", "Image Orientation": "Horizontal (normal)", "Image XResolution": "180", "Image YResolution": "180", "Image ResolutionUnit": "Pixels/Inch", "Image DateTime": "2005:06:29 14:56:02", "Image YCbCrPositioning": "Centered", "Image Tag 0x1001": "2048", "Image Tag 0x1002": "1536", "Image ExifOffset": "278", "Image CustomRendered": "Normal", "Image ExposureMode": "Auto Exposure", "Image WhiteBalance": "Auto", "Image DigitalZoomRatio": "1", "Image SceneCaptureType": "Standard", "Thumbnail Compression": "JPEG (old-style)", "Thumbnail XResolution": "180", "Thumbnail YResolution": "180", "Thumbnail ResolutionUnit": "Pixels/Inch", "Thumbnail JPEGInterchangeFormat": "2132", "Thumbnail JPEGInterchangeFormatLength": "4499", "EXIF ExposureTime": "1/200", "EXIF FNumber": "9/2", "EXIF ExifVersion": "0220", "EXIF DateTimeOriginal": "2005:06:29 14:56:02", "EXIF DateTimeDigitized": "2005:06:29 14:56:02", "EXIF ComponentsConfiguration": "YCbCr", "EXIF CompressedBitsPerPixel": "3", "EXIF ShutterSpeedValue": "245/32", "EXIF ApertureValue": "139/32", "EXIF ExposureBiasValue": "0", "EXIF MaxApertureValue": "13/4", "EXIF MeteringMode": "CenterWeightedAverage", "EXIF Flash": "Flash did not fire, compulsory flash mode", "EXIF FocalLength": "58", "EXIF FlashPixVersion": "0100", "EXIF ColorSpace": "sRGB", "EXIF ExifImageWidth": "2048", "EXIF ExifImageLength": "1536", "EXIF FocalPlaneXResolution": "128000/13", "EXIF FocalPlaneYResolution": "128000/13", "EXIF FocalPlaneResolutionUnit": "2", "EXIF SensingMethod": "One-chip color area", "EXIF FileSource": "Digital Camera"}