It uses a rotary motion to grab the hay with spinning tines and then cast it out the back of the machine.
{"Image Make": "Google", "Image Model": "Pixel 3 XL", "Image Orientation": "Horizontal (normal)", "Image XResolution": "72", "Image YResolution": "72", "Image ResolutionUnit": "Pixels/Inch", "Image Software": "HDR+ 1.0.332953048zdr", "Image DateTime": "2021:06:24 16:55:55", "Image ExifOffset": "200", "EXIF ExposureTime": "1770/391853", "EXIF FNumber": "9/5", "EXIF ExposureProgram": "Program Normal", "EXIF ISOSpeedRatings": "54", "EXIF ExifVersion": "0231", "EXIF DateTimeOriginal": "2021:06:24 16:55:55", "EXIF DateTimeDigitized": "2021:06:24 16:55:55", "EXIF OffsetTime": "-04:00", "EXIF OffsetTimeOriginal": "-04:00", "EXIF OffsetTimeDigitized": "-04:00", "EXIF ComponentsConfiguration": "YCbCr", "EXIF ShutterSpeedValue": "779/100", "EXIF ApertureValue": "17/10", "EXIF BrightnessValue": "269/50", "EXIF ExposureBiasValue": "0", "EXIF MaxApertureValue": "17/10", "EXIF SubjectDistance": "3911/1000", "EXIF MeteringMode": "CenterWeightedAverage", "EXIF Flash": "Flash did not fire, compulsory flash mode", "EXIF FocalLength": "111/25", "EXIF SubSecTime": "240733", "EXIF SubSecTimeOriginal": "240733", "EXIF SubSecTimeDigitized": "240733", "EXIF FlashPixVersion": "0100", "EXIF ExifImageWidth": "2500", "EXIF ExifImageLength": "1406", "EXIF SensingMethod": "One-chip color area", "EXIF SceneType": "Directly Photographed", "EXIF CustomRendered": "Custom", "EXIF ExposureMode": "Auto Exposure", "EXIF WhiteBalance": "Auto", "EXIF DigitalZoomRatio": "0", "EXIF FocalLengthIn35mmFilm": "27", "EXIF SceneCaptureType": "Standard", "EXIF Contrast": "Normal", "EXIF Saturation": "Normal", "EXIF Sharpness": "Normal", "EXIF SubjectDistanceRange": "3"}