Bird migration

Hi Susanne!!!
I was reading about migration and looking for terms or phrases for my piece and I found many things about
bird migration.

I remembered your piece seems very nice to compare our migration with the bird migration

From Wikipedia, the free encyclopedia

A flock of barnacle geese during autumn migration

Bird migration is the regular seasonal journey undertaken by many species of birds. Bird movements include those made in response to changes in food availability, habitat or weather. These however are usually irregular or in only one direction and are termed variously as nomadism, invasions, dispersal or irruptions. Migration is marked by its annual seasonality.[1] In contrast, birds that are non-migratory are said to be resident or sedentary.

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