Original Research

The migration and conservation of birds in a Southern African context

H. Bouwman, S. W. Evans
Suid-Afrikaanse Tydskrif vir Natuurwetenskap en Tegnologie | Vol 16, No 4 | a680 | DOI: https://doi.org/10.4102/satnt.v16i4.680 | © 1997 H. Bouwman, S. W. Evans | This work is licensed under CC Attribution 4.0
Submitted: 11 July 1997 | Published: 11 July 1997

About the author(s)

H. Bouwman,, South Africa
S. W. Evans,, South Africa

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Abstract

The migration of birds is a phenomenon that has been studied for more than two thousand years. Almost half of the extant bird species undertake migration, covering distances of a few tens of kilometres, up to a calculated 50 000 km per year, sometimes at heights exceeding 9 000 m, at very low temperatures, during the day or night. Some species fly actively and continuously for more than a 100 hours, whilst making efficient use of energy. A variety of strategies and physiological mechanisms are used to perform such feats, but many remain to be studied.

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