Population studies exist for some individual birds-of-paradise species, but the 44 species in the family are not tracked under one combined census, and several inhabit remote New Guinea forest interiors that have never been comprehensively surveyed.
What would resolve this Species-by-species population surveys across the full range of Paradisaeidae, aggregated into one family-wide estimate.
OpenOrnithology and conservation biologyBird-of-paradise (Wikipedia)