Red-billed Malkoha sighted for the first time

Red-billed Malkoha ( Zanclostomus javanicus) - "Cenok Api" - Malay
Under-tails are bluish grey, interspersed with white tips of graduated inner-tail feather.
Location : Botanic Island One, Zone D

The Red-billed Malkoha is the second rarest malkoha in Borneo, after the Chestnut-bellied Malkoha (Phaenicophaeus sumatranus)
Location : Botanic Island One

This is a lifer for 2016.  The Red-billed Malkoha was heard uttering some distinctive sounds from Botanic Island One.  The calls sounded like a muted "oak, oak, oak, oak ,oak", repeated many times.  I wasn't sure what bird produces the repetitive calls though my best guess was a malkoha.  But surprise! it was a Red-billed Malkoha.  In 2013 and 2014 the Chestnut-breasted Malkoha have occasioned the park many times. This year it is another malkoha species and is the second rarest malkoha on this big island of Borneo.  What is appealing about the bird is its red bill and its rufous lores, chin, throat and breast.  The orangish colour is in striking contrast with the greenery of the jungle. Its long tail is dark bluish green.  All in all it is a lovely bird and I wish it will come to the park more often.