The Manus Cuckooshrike is a large cuckooshrike with a large bill; historical descriptions also note dark primaries and black undersides to the tail-feather shafts. A field report saw one on Manus along a road through patches of secondary forest and gardens.
The account on p. 290 of Novitates Zoologicae 23 (1916) describes C. papuensis ingens as exceptionally large, with dark primaries and the undersides of the tail-feather shafts black. Mayr (1955) compared birds from Manus and Los Negros with subspecies sclateri: the colour was similar, but ingens was larger and had a larger bill. These are regional specimen comparisons, not a full description of plumage by sex or age.
A 2014 BirdQuest report recorded one Manus Cuckooshrike from the little-travelled trans-island road, which passed patches of secondary forest and gardens; the observers viewed the bird through a scope. A 2019 Manus field report later recorded two along the main road at Rossun and one in Samuel’s garden there. These are observations along a route and around a village, not evidence that the species prefers modified habitats. The reports do not describe feeding or nesting.
An extinction-risk assessment has not been added yet.