How old is your gosling...are you just observing colors in the down or feathering? My talouse has yellow underneath and brown/gray on top plus a brown/gray beak and grayish pink feet. Posting a picture would really help out with this. Or you can try looking for images amongs the various search engines by typing in goslings and the names of different breeds of goose... such as canadian gosling or brown african gosling... I'm sure you can rule out embdens, snow geese and romans since they are all white...