The dates of arrival and departure on a migration have long been the focal point for one of the most intensively studied aspects of avian biology. Yet it seems that their might be another factor of possibly greater importance than an “early” or “late” sighting; this being the fluctuating abundance among the migrants during their passage.
Author: Richard Ambrose
Volume Number: 14 Year Published: 1966
Issue Number: 4
Page Number: 41
Link to article: http://birdlife.aosbirds.org/1966/Vol 14 No. 4_1966_p41-43.pdf
Link to the full issue of BirdLife: http://birdlife.aosbirds.org/1966/Vol 14 No. 4_1966.pdf