Isabela Oriole

It is a medium sized bird of the lowland forest of Northern Luzon. It is primarily yellow with a hint of olive on its upper parts. Its bill is large and silver. This species has multiple class. One call is a repeated whistle with descending first note followed by a quick rising second note. It also has a rattling call. The Isabela oriole is commonly confused with the much more common white-lored orioles and black-naped orioles. It is differentiated by its extremely large grey bill, uniform olive-yellow plumage and lack of white on its lores. The Isabela oriole is most closely related to the white-lored oriole. Both species are closely related to the paraphyletic Philippine oriole. The Isabela oriole is sometimes considered to form a superspecies with the dark-throated oriole and the Philippine oriole. Alternate names for the Isabela oriole include the green-lored oriole and olive-lored oriole.

The Isabela oriole is now confined to the lowland forests in the Northern Sierra Madre mountain range in Luzon. It is frequently seen in the canopy and middle storeys of forests and also forest edge or patches up to 440 masl. It has not been recorded in Bataan province since 1947 despite an intensive search done in 2014.

Feeds mostly on fruit but also insects such as larvae and caterpillars. Typically seen alone, in pairs or small groups in the middle storey to the canopy. It is seen in mixed flocks with other birds such as bar-bellied cuckooshrikes, black-and-white trillers, blackish cuckooshrikes and other forest birds. Breeding believed to occur during April to June. In 2022, the first record and photographs of a juvenile were released.