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Keywords: polar night
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Journal Articles
J Exp Biol (2005) 208 (22): 4231–4241.
Published: 15 November 2005
... <0.001): from September to mid-December this effort increased gradually to reach average levels of 73±19 min day -1 between mid-December and early February (during the polar night). Foraging effort subsequently decreased with increasing day lengths until the end of April (to ∼50 min day -1 ). As birds...