Volume 30 September 7, 2020 Number 17
Volume 30 Number 17 September 7, 2020 Volume 30 Number 17 Pages R000–R000; 000–000 September 7, 2020 R000–R000; 30 Number 17 Pages Volume ll CCURBIO_30_17.c1.inddURBIO_30_17.c1.indd 1 113-Aug-203-Aug-20 77:35:50:35:50 PPMM ll Magazine Correspondence generations) elicit violent fi ghts or ‘power consumption (Figure 1A). Stored acorns struggles’, among multiple same-sex are consumed by adults when food is Tracking the warriors coalitions from neighboring groups. Here, scarce and are also fed to nestlings. using an automated radio-telemetry Granaries are pilfered by intra- and and spectators of system, we found that individuals in interspecifi c competitors and are coalitions competing for breeding thus zealously defended by all group acorn woodpecker vacancies — the ‘warriors’ — invested members. Large-granary territories are wars up to ten hours per day on successive often controlled by polygynandrous days before one coalition emerged groups consisting of multiple male and victorious. Power struggles also attracted female breeders and their non-breeding 1,4, 1 Sahas Barve *, Ally S. Lahey , ‘spectators’— acorn woodpeckers not offspring (‘helpers’). Same-sex co- 2 Rebecca M. Brunner , eligible to fi ll the breeding vacancy. breeders are closely related to each other 3 1 Walter D. Koenig , and Eric L. Walters Apparently present only to gain social but unrelated to breeders of the opposite information, spectators travelled from sex [3]. In addition to within-group Although intergroup confl ict is territories as far as over three kilometers dynamics, acorn woodpeckers recognize widespread in vertebrates, simultaneous away. Our study reveals the complexity associations among individuals outside agonistic interactions among several of acorn woodpecker social group their group and track membership groups are rare [1].
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