Canada rings the changes for study of northern birds.
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D025041:Animal Migration; D000818:Animals; D001695:Biology / Q000379:methods / Q000639:trends*; D001717:Birds / Q000502:physiology*; D002170:Canada; D017753:Ecosystem; D007554:Isotopes; D012106:Research / Q000639:trends; D012107:Research Design; D014197:Trees; D014828:Vocalization, Animal
D007554:Isotopes