 In 1977 professor Akira Nishimura began the first systemic study of the northern muriquis, to be followed by Russell Mittermeier and Karen B. Strier.At the time the long-term study of the muriquis began Abdala was in his 70s.Besides the forest, his farm included an active coffee plantation and cattle ranch, and employed over 20 families whose houses were on the farm.