He has been an authority on New Guineabirds for several decades, having authored or co-authored several major works on the biodiversity this, the largest tropical island, including The Birds of Paradise (1998), The Birds of New Guinea (1986, 2015) and the two-volume Ecology of Papua (2007).
To the general public, Beehler is best known for having co-led a widely published rapid assessment survey on biological diversity in 2005 to the Foja Mountains, Papua, where he, together with an international team of 11 scientists, the majority from the Indonesian Institute of Sciences (LIPI), made a number of scientific discoveries.
The findings on this survey expanded on previous research conducted in the region by Dr. Jared Diamond in the late 1970s and early 1980s. Beehler and colleagues, however, returned with the first ever photographs of two species of birds, the bronze parotia (Parotia berlepschi) and the golden-fronted bowerbird (Amblyornis flavifrons), that previously were known only from a few specimens. Additionally, a previously unknown species of honeyeater was discovered, it being scientifically described in 2007 as the wattled smoky honeyeater (Melipotes carolae). The specific epithet, carolae, commemorates Carol Beehler, the wife of Bruce Beehler. Together with a team from 60 Minutes, Beehler returned to the Foja Mountains in 2007, resulting in the first ever filming of several of the species discovered in 2005, as well as encounters with an undescribed giant rat (Mallomys sp.) and a tiny pygmy possum (Cercartetus sp.).
Works
Thane K Pratt; Bruce McP Beehler "Birds of New Guinea, second edition, Princeton, NJ : Princeton University Press, 2015. ISBN9780691095622
Birdlife of the Adirondack Park, Glens Falls, NY : Adirondack Mountain Club, 1978.
Upland birds of northeastern New Guinea, Wau, Papua New Guinea : Wau Ecology Institute, 1978.
A naturalist in New Guinea, Austin, Texas : University of Texas Press, 1991. ISBN9780292755413
New Guinea : nature and culture of the world's grandest island, Princeton, NJ : Princeton University Press, 2020. ISBN9780691180304
North on the wing : travels with the songbird migration of spring, Washington, DC : Smithsonian Books, 2018. ISBN9781588346131
Lost worlds : adventures in the tropical rainforest, New Haven, Conn. ; London : Yale University Press, 2009. ISBN9780300158335, OCLC317471890
Bruce McP Beehler; Thane K Pratt; Mary Lecroy Birds of New Guinea: Distribution, Taxonomy, and Systematics. Princeton, New Jersey : Princeton University Press, 2016. ISBN9780691164243, OCLC919479531
Bruce McP Beehler; John Anderton, Natural encounters : biking, hiking, and birding through the seasons, New Haven : Yale University Press, 2019. ISBN9780300243482, OCLC1055264404