A five-day study of the time of roosting and awakening of 13 species of birds was
made near Booligal, N.S.W. in May 1975. It is probable that the time of roosting and
awakening varies as a function of light intensity, and evidence was found of an
anticipatory period between awakening and leaving the roost in the Black-faced
Woodswallow. In general smaller birds, insectivores and partly or solitary roosting species
left the roost earlier at dawn and entered the roost later at dusk than larger birds,
graminivores and social or partly-social roosting species.
