[1] In 2005, satellite imagery estimates showed approximately 700 km2 (270 sq mi) of total remaining habitat within its geographic range.

[5] It is highly threatened by hunting and habitat loss, and was considered to be among the 25 most endangered primates in 2006–2008.

[6] It is currently listed as Critically Endangered by the International Union for Conservation of Nature (IUCN) due to a highly restricted range,[1] and has been named one of "The World's 25 Most Endangered Primates.

[5][8] Recent genetic and morphological evidence has suggested that the former name, E. albocollaris, was actually a junior synonym of E.

However, genetic and field studies still support subspecies status under the biological species concept.