What is al­ti­tu­di­nal mi­gra­tion?

BBC Wildlife Magazine - - Q&A - SM

AIt's when birds that live on high slopes – such the moun­tain quail in North Amer­ica ( left) and the dip­per in the UK – head to lower el­e­va­tions for win­ter. Th­ese down­hill trav­els are rel­a­tively short in terms of miles cov­ered, count­ing among the short­est mi­gra­tory jour­neys in the world, yet still re­sult in a sig­nif­i­cantly dif­fer­ent habi­tat.

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