Most of the primates are a sort of monkey called rhesus macaques. They are designated for use in scientific research, including experiments for COVID-19.
Further, it has recently been shown that rhesus monkeys kept on caloric-restricted diets for an extended time (nearly 15 years) have less chronic disease.
In the 1960s and 1970s, scientists studying rhesus macaques and chimpanzees used computer programs to figure out the range of sounds they should be able to make.
These researchers took X-ray videos of three living rhesus macaques while they were making a bunch of different facial expressions: like making noises, chewing, and swallowing.
研究人员拍摄了三只活体恒河猴的 X 光视频,它们正做出一系列不同的面部表情:比如发出声音、咀嚼和吞咽。