(CNN) The last of the "Gorillas in the Mist" -- made famous by renowned American primatologist Dian Fossey -- is believed to have died. A gorilla known as Poppy, who would have turned 43 on April 1, has not been seen by trackers since August last year , according to Fossey's namesake nonprofit organization. Poppy was born nine years after Fossey established a camp within Rwanda's Volcanoes National Park in 1967 as part of an effort to study the area's vanishing mountain gorilla population. Poppy pictured here in August 2015 was the last living mountain gorilla studied by famed zoologist Dian Fossey. Her mother, Effie, was the powerful matriarch whose members are now spread across many gorilla groups in the national park.

Source: CNN May 28, 2019 20:07 UTC