Birds mi­grate to bal­ance en­ergy, study shows

Canadian Wildlife - - DISPATCHES -

New work pub­lished in Na­ture Ecol­ogy & Evo­lu­tion shows that birds mi­grate to pre­serve a bal­ance between the amount of en­ergy they take in and the amount they ex­pend. By an­a­lyz­ing the recorded move­ments of the 15 per cent of mi­grat­ing bird species world­wide and plac­ing the data in a vir­tual en­vi­ron­ment, Bri­tish re­searchers were able to show that the birds who mi­grate do so to op­ti­mize their “en­ergy bud­get” in the face of chang­ing sea­sons and com­pe­ti­tion from other species. This is the first study to show a mo­ti­va­tion for mi­gra­tion across all mi­gra­tory bird species. For more in­for­ma­tion, see na­ture.com.

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