2026-05-05T22:03:27Zhttps://uvadoc.uva.es/oai/request

oai:uvadoc.uva.es:10324/648372024-01-24T09:19:54Zcom_10324_1137com_10324_931com_10324_894col_10324_1222

00925njm 22002777a 4500 dc Hernández Lázaro, Ángel author 2021 This study provides novel information about gregariousness and intraspecific aggression in Iberian bullfinches (Pyrrhula pyrrhula iberiae) in northwestern Spain. Small monospecific parties never exceeding 10 individuals were seen throughout the year, larger in winter on average. Males considerably outnumbered females within the groups. Adult flocks were frequent only in winter. In spring, many of the adult groups were mixed-sex assemblages composed of pairs plus supernumerary males. Sightings of juvenile groups, up to seven individuals, were common in summer–autumn. The vigilance role in mixed-sex assemblages, including pairs, appeared to be the responsibility of males based on sex-specific vigilance rates. The highest frequency of aggressive encounters, mainly male against male, occurred during the breeding season, associated with mate defence. Females attacked males, not the contrary, which supports reversed sexual dominance in bullfinches. Gregariousness probably acted as an anti-predatory and foraging strategy. Behaviour, 2021, vol. 159, n.7, p. 615–642 0005-7959 https://uvadoc.uva.es/handle/10324/64837 10.1163/1568539X-bja10143 615 7 642 Behaviour 159 1568-539X Gregariousness and intraspecific aggression in Iberian bullfinches (Pyrrhula pyrrhula iberiae) throughout the year