Northern sportive lemur have large bacteria-filled ceca, which helps them to digest plant matter such as cellulose and break it down into sugars and starches. The northern sportive lemur is preyed on by the native Malagasy tree boa, which hunts the lemurs while they are sleeping in tree holes. Large birds of prey, Falconiformes and Strigiformes, are also natural predators of the lemurs. Along with these ecological threats, the arboreal lemur species are also highly threatened by human charcoal production, which still continues to remove the only remaining forest habitat of the lemurs, greatly restricting their range. "L. septentrionalis" is also illegally hunted
The Birds of America framed. They are all hanging throughout the public areas of the Woodstock Inn, in Woodstock, Vermont, which he built in 1969. Paisley Museum and Art Gallery, in Paisley Scotland has the four volume elephant folio of Birds of America. The Royal College of Physicians and Surgeons in Glasgow, Scotland holds one volume which is on display in the library, together with an interactive version. Though individual prints are commonly available, only one hundred twenty complete sets are known to exist. One complete copy of "The Birds of America" exists as part of The Darlington Collection at the University of Pittsburgh.