Abstract

During mating, and during the phases known as solitary male, harem formation, and harem, male Greater Rheas (Rhea americana) became vigilant to assure the elimination of competitors. High rates of harem defense and male expulsion were observed at the start, with levels decreasing gradually through the phases of mating, and male-male fighting mainly limited to the phase of harem formation. Courtship was nonexistent early in the mating period, reached a high level during the phases of harem formation and harem, then declined markedly just before harem breaking. The rates of all male social activities decreased significantly just before harem breaking.

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