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Titre :	The 'Northern Bullfinch' invasion of autumn 2004
Auteurs :	Mike G. Pennington, Auteur ; Eric R. Meek, Auteur
Type de document :	Article
Dans :	British Birds (99(11) NOV 2006)
Article en page(s) :	2-24
Résumé :	A record invasion of 'Northern Bullfinches' Pyrrhula pyrrhula pyrrhula occurred in Britain in autumn 2004. It also affected many other parts of Europe with birds being recorded as far afield as Iceland, Ireland, Italy and Bulgaria. As well as in Britain and Ireland, record numbers were seen in parts of Scandinavia and several countries in central and eastern Europe. Field identification of 'Northern Bullfinches' is difficult, as there is no single diagnostic feature. However, trapped birds are easily separable using biometrics (particularly wing length). Many, but not all, birds in the 2004 influx were giving a distinctive call, which became known as the 'trumpet call'. This call is not diagnostic of Northern Bullfinch, as birds over most of the range of this subspecies give a call hardly distinguishable from that of 'British Bullfinch' P. p. pileata. Although the 'trumpet call' was unfamiliar to most observers and attracted much attention, it was soon established that birds giving such a call had been recorded in northern and western Europe before. Speculation on the birds' origin was widespread, and research so far has suggested that European Russia is the most likely source (a recording from the Komi Republic matches the 'trumpet' call), although others, possibly lingering from previous influxes, have been heard farther west in the breeding season.

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