Age-related foetal sex ratio bias in Iberian red deer ( Cervus elaphus hispanicus ): are male calves too expensive for growing mothers?
Division of labor and the evolution of task sharing in queen associations of the harvester ant Pogonomyrmex californicus
Factors affecting vigilance within wild mixed-species troops of saddleback ( Saguinus fuscicollis ) and moustached tamarins ( S. mystax )
How Kentish plovers, Charadrius alexandrinus , cope with heat stress during incubation
Male-male interference competition decreases spawning rate in the European bitterling ( Rhodeus sericeus )
Differential reproductive success among subfamilies in queenless honeybee ( Apis mellifera L.) colonies
Multiple paternity and colony homeostasis in Lasius niger ants
Female courtship in the Banggai cardinalfish: honest signals of egg maturity and reproductive output?
Sperm swimming speed and energetics vary with sperm competition risk in bluegill ( Lepomis macrochirus )
Functional reference in an alarm signal given during nest defence: seet calls of yellow warblers denote brood-parasitic brown-headed cowbirds
Brood neglect and contingent foraging behavior in a pelagic seabird
Help or disperse? Cooperation in termites influenced by food conditions