FIRST RECORD OF COOPERATIVE BREEDING IN ATHRYOTHORUS WREN

Buff-breasted Wren (Thryothorus leucotis) Science Article 3

abstract

Although offspring delay dispersal past the age of independence in many Thryothorus species,cooperative breeding has not been recorded in this genus. Here, I present the first observation of cooperativebreeding in a Thryothorus wren (Buff-breasted Wren, T. leucotis). Of 41 offspring that delayed dispersal pastthe age of independence, 4 individuals stayed on their natal territory until their parent’s next breeding attempt,indicating a low potential for cooperative breeding. Of these four individuals, one male provisioned 11- to 15-day-old nestlings and one female approached her parents’ nest but was repeatedly driven away from it by herfather. The retained female was apparently tolerated when in the vicinity of fledglings, but feeding was neverpositively confirmed.

SHARON A. GILL, Wilson Bulletin 116(4):337-341, 2004

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