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Anser anser
Geese
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.