green monkey
US /ˌɡriːn ˈmʌŋ.ki/
UK /ˌɡriːn ˈmʌŋ.ki/

1.
a small, slender monkey (Chlorocebus sabaeus) native to West Africa, with greenish-brown fur and a long tail.
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The green monkey is known for its distinctive facial features and agile movements.
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Researchers are studying the behavior of green monkeys in their natural habitat.