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Races of Phylloscopus trochilus

There appear to be two clearly differentiated races occupying opposite ends of the species range.

Phylloscopus trochilus trochilus (nominate race) SW and central European race - inc Britain.

smaller more olive-green and yellow than:-

P.t.trochilus

Phylloscopus trochilus yakutensis (Eastern race) East Siberian race.

larger and more pale brown and white                                            .

P.t.yakutensis

Between these two is a whole assemblage named Phylloscopus trochilus acredula (N. Europe and W. Siberian race).

P.t.acredula                                       acredula typeP.t.acredula type

Highly variable from 'typical' acredula - pale olive-green to 'eversmanni' brown and white types.

P.t.eversmanni

Difficult to separate on plumage characters but can sometimes be separated with experience.

race trochilus acredula yakutensis
wing(mm) 60 - 71 62 - 71.5 64 - 74
wt(g) 7.5 - 12.0 7.7 - 10.0 7.0 - 15.0
tarsus(mm) 17.4 - 21.1 18.0 - 20.5  
tail (mm) 45.0 - 55.0 47.0 - 57.5 50.0

races

td bgcolor="#00FFFF">50.0 - 63.0

races