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State-dependent behaviour and energy expenditure: an experimental study of European robins on winter territories |
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| Authors: | J. D. Godfrey D. M. Bryant |
| Affiliation: | Avian Ecology Unit, Institute of Biological Sciences, University of Stirling, Stirling, Scotland FK9 4LA, UK |
| Abstract: | |
| Keywords: | body condition doubly labelled water Erithacus rubecula song state-dependent behaviour. |