UNIVERSITY PARK, Pa. — Deeper male voices in primates, including humans, offer more than sex appeal — they may have evolved as another way for males to drive off competitors in large groups that ...
Monogamy : past and present / Ulrich H. Reichard -- Evolution of monogamy : mating relationships, parental care and sexual selection / Anders Pape Møller -- Mate guarding and the evolution of social ...
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