The Fruithunter Chlamydochaera jefferyi  is one of the most sought after birds in the mountains of Borneo.  Its scarcity may be associated with its feeding habits of moving around the forest in search of fruiting trees and staying in the area for only as long as the fruit supply last.  Also not very helpful is its high-pitched, drawn-out see-eet call which is usually very soft.  Once I observed a pair taking turns to feed their young.  One parent always stayed with the nestling while the other was out.  Good parenting!