The insectivorous willie wagtail, Rhipidura leucophrys,
exhibits a range of discrete, easily identified foraging behaviours that
include wagging the tail and flashing the wing. We investigated whether
wagtails adjust these, and other foraging behaviours, according to the time of
day and environmental conditions. The rates of tail-wagging and wing-flashing
were influenced by the time of day and light intensity. Tail-wagging was more
frequent at the start and end of the day, while wing flashing was more
frequent during the middle of the day. The rate of aerial prey captures was
also highest during the middle of the day and lower in the early morning and
late afternoon. These daily patterns of foraging behaviours correspond with
the patterns of insect activity, which was greater in the middle of the day
than in the early morning or late afternoon. The field data, together with
experiments using a model wagtail tail, support the view that tail-wagging and
wing-flashing are used to flush insect prey.
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