It's easy to think that the joint in the middle of the visible part of a bird wing is the elbow. In fact, this is the equivalent of our wrist! The flight feathers that are attached to the hand, which is the outer half of the wing, are called primary feathers. The flight feathers on the arm are called secondary feathers.
{"Image Orientation": "Horizontal (normal)", "Image XResolution": "127/5", "Image YResolution": "127/5", "Image ResolutionUnit": "Pixels/Inch", "Image YCbCrPositioning": "Centered", "Image ExifOffset": "102", "EXIF ExifVersion": "0210", "EXIF ComponentsConfiguration": "YCbCr", "EXIF FlashPixVersion": "0100", "EXIF ColorSpace": "Uncalibrated", "EXIF ExifImageWidth": "634", "EXIF ExifImageLength": "395"}