rhesus monkey
US /ˈriːsəs ˌmʌŋki/
UK /ˈriːsəs ˌmʌŋki/
1.
a medium-sized brown monkey (Macaca mulatta) of southern Asia, often used in medical research
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Scientists often use rhesus monkeys in studies because of their genetic similarity to humans.
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The rhesus monkey is native to South, Central, and Southeast Asia.