Black crested mangabey near the zoo fence

black crested mangabey crested lophocebus aterrimus furry captive grid herbivore fence looking around congo crest exotic animals expression no people park behavior behaviour closeup environment eyes hair curious zoo primate monkey mangabey ape animal wildlife wild tropical omnivore nature mammal lophocebus habitat loss habitat face crest of hair close up black aterrimus fur cute young vulnerable species portrait