Bulbul ( Bornean split of peninsula Ocracheous) - Penan Bulbul

 I not sure whether to consider it  as a lifer  though it was a split recently in Aug 2021. It has some similarity to the low to mid montane Ochraceous or even Grey-cheeked of peninsula. The Penan bulbul (Alophoixus ruficrissus) is a species of songbird in the bulbul family, Pycnonotidae. It is found Borneo. It is usually found in the mid-storey of broad-leaved evergreen and rainforests up to 2000 metres elevation. It can be easily seen in KNP 

A brownish-olive bulbul with a wispy crest and a puffy, glowingly white throat. Inhabits lowland and montane forests, where it prefers primary or well-aged secondary growth. Forages in the middle and lower levels of the forest, usually in small, noisy flocks. Calls consist primarily of loud, dry “chek” notes; song is pleasant and warbling. Similar to Gray-cheeked Bulbul, but darker, especially on the underparts, with a more conspicuous white throat and a longer crest. (Extract from eBird)