Changeable Hawk-eagle dark morph

Learned avian naturalists have spent considerable time delving into the taxonomic ranking of  crested hawk-eagles.  From a birdwatcher point of view, the resident crested hawk-eagle being polymorphic and having 2 main morphs, earns itself the name “Changeable”, with the dark morphs being more common.  Mainly a forest bird, it is also seen at forest edge, no doubt hoping for an easy meal.  Race in Borneo Nisaetus cirrhatus limnaetus.