This journal provides immediate access to some articles. Volume 266(1437); December 22, 1999 Sex differences in energy expenditure in non-human primates. PMCID: PMC1690481 Joint effects of feeding and breeding behaviour on trophic dimorphism in hummingbirds PMCID: PMC1690480 Evolution of stepping-stone dispersal rates. PMCID: PMC1690488 Scrapie transmission in Britain: a recipe for a mathematical model. PMCID: PMC1690487 | ||