Photo: Monica Szczupider / National Geographic
When Dorothy, a beloved female chimp died at the Sanaga-Yong Chimpanzee Rescue Center in Cameroon, her burial was witnessed by the rest of the chimps residing there.
Monica Szczupider took this photo that showed a wall of grieving chimps paying their last respect:
Speaking about Dorothy, Miss Szczupider, 30, said the chimp was a "prominent figure" within a group of about 25 chimps.
"Chimps are not silent. They are gregarious, loud, vocal creatures, usually with relatively short attention spans", she said.
"But they could not take their eyes off Dorothy, and their silence, more than anything, spoke volumes."