New additions to the avifauna of Obi island, Indonesia, with comments on migration and breeding seasonality of Moluccan birds

Obi is a remote island in the endemic-rich northern Moluccas region of Wallacea. Despite recent ornithological expeditions in 2010 and 2012, much remains to be learned about its avifauna in terms of distribution, migration patterns, and breeding phenology. We made a collecting trip to Obi in November–December 2013, and here describe noteworthy observations made during our visit. Six migratory species not previously known from Obi were recorded, including the first Middendorff’s Grasshopper Warbler Locustella ochotensis for the Moluccas and the first Siberian Blue Robin Luscinia cyane for Wallacea. Our observations, in conjunction with those of previous visitors, help elucidate the seasonal breeding patterns of a number of resident birds, including Moluccan Woodcock Scolopax rochussenii and several rails. We also include records that expand the known altitudinal ranges of four resident species, as well as notes on species infrequently recorded from Obi, such as Sulawesi Myzomela Myzomela chloroptera and Metallic Pigeon Columba vitiensis. Although ornithological knowledge of Obi has increased dramatically in recent years, the very highest reaches of the island, as well as the eastern lowlands, remain mostly unsurveyed and should be targeted by future visitors.