Angolan colobus monkeys, guenon, marmosets and mandrills also call this area home. There is a population of the vulnerable white-throated guenon, a primate. Sclater's guenon was formerly classified as a subspecies of the red-eared guenon ("C. erythrotis"). In all other monkey and apes species, the French word "guenon" only designates the females. The book "Studies in Freemasonry and the Compagnonnage" by Rene Guenon was published in 1964. Nonetheless, the use of the term guenon for monkeys of this genus is widely accepted. In 1930 she became friends with Rene Guenon who just moved to Cairo. The white-throated guenon is still considered a vulnerable species due to its decreasing population. The diet of Sclater's guenon is unknown. The patchwork jungle has led to many different species of guenon evolving. The red-tailed guenon is within the sub-order Haplorhini which is separated into two parvorders. Brodmann area 6 is a cytoarchitecturally defined portion of the frontal lobe of the guenon. In the English language, the word "guenon" is apparently of French origin. In the guenon this area is referred to as area 24 of Brodmann-1905. Troop sizes are small for a guenon, ranging from 2-10 individuals on average.