Notes on the birds of Isabel, Solomon Islands, including the first record since 1927 of Island Leaf Warbler Phylloscopus maforensis

The birds of the Solomon Islands have received ample historical attention by explorers, collectors and researchers. Despite this, knowledge of the region's avifauna is categorised by BirdLife International as ‘poor’ and multiple new populations of birds have been found in recent years, highlighting our incomplete knowledge of the region's avifauna. Here, we present new information on the elevational occurrence, abundance and natural history for ten bird species we observed on Isabel Island. The data we present are based on three weeks of field work at three field sites that included the restricted montane forests above 1,000 m elevation on the Kubonitu-Sasari massif. In this poorly known montane area we observed multiple Island Leaf Warblers Phylloscopus maforensis for the first time since it was discovered on Isabel in 1927.