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Packing Fruits at Dusk: Fuel Storage in an American Robin Wintering in Western Oregon
Vol. 78, No. 2 (Autumn, 1997), pp. 62-64
Published by: Society for Northwestern Vertebrate Biology
Stable URL: http://www.jstor.org/stable/3536847
Page Count: 3
You can always find the topics here!Topics: Fruits, Foraging, Birds, Aerial locomotion, Ingestion, Esophagus, Animal digestion, Cost efficiency
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During the final 3 hr of daylight on 6 February 1989, I recorded the behavior of an American robin, Turdus migratorius, foraging on fruits of the hawthorn, Crataegus monogyna in western Oregon, USA. Fruit intake increased (fewer picked fruits were rejected) as dusk approached and time before flying to roost decreased. Foraging bout length and foraging rate remained constant. The observed behavior may reflect the need for frugivores that are gut-process limited to store fuel (fruits) in an extendible esophagus before nightfall.
Northwestern Naturalist © 1997 Society for Northwestern Vertebrate Biology