Long-tailed tits Aegithalos caudatus with white or whitish head in Wallonia and in Brussels before 2010Original Title (non-English) LES MESANGES A LONGUE QUEUE AEGITHALOS CAUDATUS A TETE BLANCHE OU BLANCHATRE EN WALLONIE ET A BRUXELLES AVANT 2010 [French]

摘要

Among the observations of Long-tailed tits in Wallonia and Brussels for the period 1966 to 2009, one bird in 584 was noted as having a white head. These observations come from all the ecoregions of the country, and there were no significant variations between months. This suggests that this is primarily a case of local variants of the resident subspecies. A partial systematic census of the nesting population (2001-2007) showed that the occurrence of white headed individuals was of the order of one bird in 30 territories.