Abstract
During long-term studies of breeding success among individual female Peromyscus maniculatus, we recorded a single instance of group nesting by 5 overwintered, breeding females. Two of the females were related (siblings), one was unrelated (known parentage), and two were of unknown origin. Their breeding success was not dramatically different from that exhibited by solitary nesters. We conclude that group nesting is a phenotypic response to local conditions rather than aberrant behavior with no chance of success.
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