greylag geese and bar head goose family being chased off by mean greylag geese in St James's Park.  I always used to see a greylag goose and a barhead goose hanging around together in the park.  They somehow managed to have babies, usually greylag geese, so they had their own little mixed species flock but the other greylag geese in the park hated them and would always chase them away.
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