Wood Warbler

The wood warbler is 11–12.5 cm long, and a typical leaf warbler in appearance, green above and white below with a lemon-yellow breast. It can be distinguished from similar species, like the chiffchaff P. collybita and the willow warbler, P. trochilus by its yellow supercilium, throat and upper breast, pale tertial edges, longer primary projection, and by its shorter but broader tail. It is a summer visitor to the United Kingdom, seen from April until August. It has declined there in recent years. It is rare in Ireland, where there is a very small but apparently stable breeding population in County Wicklow. Various factors associated with forest structure, including slope, forest cover, proportion of broad-leaf forest, canopy height and forest edge length, all influenced the occupancy rates of this declining forest species. Conservation measures are therefore required that provide and maintain the wood warblers preferred forest structure. There is also a preference for forest in the non-breeding season, however this habitat is declining in wintering areas such as Ghana. Despite the decline in forest habitats, there has been no change in number of wood warblers as it appears that this species can use degraded habitats, such as well-wooded farms. However, further loss of trees will likely have a negative impact on this species in the future.