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Behavior of yearling male blue grouse and its relation to delayed breeding

, : Behavior of yearling male blue grouse and its relation to delayed breeding. Wilson Bulletin 97(1): 71-77

Yearling male blue grouse (Dendragapus obscurus) were inactive during the day and were usually in or near vegetative cover, overt activity increased at dusk. Adult males displaced yearling intruders from their territories. However, some yearling males appeared to initiate agonistic interactions with territorial males. Other yearlings localized near unoccupied territorial sites but did not behave territorially. Yearlings displayed to, and courted, females away from territorial males, and made no attempt to copulate. Results partially support predictions on behavior of yearling males derived from the sexual bimaturism hypothesis to explain why 1st-year males of most promiscuous species of grouse delay breeding.


DOI: 10.2307/4162039

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