Palawan island has 27 endemic bird species today. Its avifauna is different from the rest of Philippines because of its geographic links with island of Borneo during the ice age. Many of the Bornean bird species can be found in Palawan but did not cross over to the main islands of Philippines. Some have evolved into endemic and near endemic species over the millennium due to the island effect.
Here are a few endemics that look similar to the Malaysian species that I photographed during the two days of birding there. Many thanks to the affable Totic Failana, whose local knowledge and expertise helped to find these birds.
Reference: Maia Tanedo, Robert Hutchinson, Adrian and Trinket Constantino. A Naturalist Guide to the Birds of the Philippines. 2015 John Beaufoy Publishing Limited.