Greylag Goose

I am of the opinion that all four are of the domestic variety, which were bred mainly from Greylags up to a thousand years ago with some hybridisation thrown into the mix. A lot of domestics still look like Greylags but only DNA testing is likely to prove one way or the other in mixed flocks such as this. A good rule of thumb is that Greylags generally migrate but domestics do not.

Well that suggestion is for the the one sitting down in the first image.