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Testosterone levels of free-ranging resident mantled howler monkey males in relation to the number and density of solitary males: A test of the challenge hypothesis

Challenge HypothesisBehavioral SciencesFitnessBehavioral NeuroscienceMammalogyEvolutionary BiologySexual SelectionHowler Monkey MalesSex DifferencePrimate BehaviorReproductive BiologySolitary MalesPublic HealthAnimal Behavior