calabarzon babbler Sterrhoptilus affinis

A fairly small bird of lowland and foothill forest and edge; endemic to Luzon, though lumped with Visayan Babbler under “Black-crowned Babbler” by some taxonomies. Has a gray back and cheek with fine pale streaks, dark wings and tail with white outer tail feathers, white underparts, a pale rufous throat, and a black crown. Note the slender black bill. Often joins mixed-species flocks and sometimes hangs upside down while feeding. Somewhat similar to Green-backed Whistler, especially from below, but smaller, with a pale rufous throat and a black crown. Voice includes a medium-pitched “poo piuu!” with the second note downslurred.