Fat level and temporal pattern of diurnal movements of Robins ( Erithacus rubecula ) at an autumn stopover site

摘要

I compared level and temporal pattern of diurnal movements of Robins with different fat scores at a stopover site. Fat birds were less mobile than lean ones. Lean birds were active in the morning and before noon, whereas the activity pattern of fat Robins had two peaks at sunrise and at sunset. It is suggested that the evening activity peak refers to pre-take-off movements of birds ready for migratory flight.