Regular ArticleOf great tits and fleas: sleep baby sleep . . .
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P. Christe and A. Oppliger are at the Institut de Zoologie et d'Ecologie Animale, Université de Lausanne, CH-1015 Lausanne, Switzerland.
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Correspondence: H. Richner, Zoology Department, University of Bern, CH-3032 Hinterkappelen, Switzerland (email: [email protected]).
Copyright © 1996 The Association for the Study of Animal Behaviour. Published by Elsevier Ltd. All rights reserved.