Institution: | Max-Planck-Institut für Verhaltensphysiologie, D-82319 Seewiesen, GermanyInstitute of Zoology, Zoological Society of London, Regent's Park, London NW1 4RY. Present address: USAID PPC/DP, Room 3637 NS, 320 21st St. NW, Washington, DC 20523-0034 U.S.A., email: |