My father had a very large turkey unit and we often had turkey for dinner. They would put their heads out of one hole in the mesh and back in the next one along - the drawback of a long neck. I would be a bit wary if the gosling had lain outside in the sun for very long, but if it seems fresh then go for it ! Would cooking be any different to cooking a goose? Maybe a little less fatty? It should still roast ok. If it's not worth plucking you could skin it and make a casserole.