vervet monkey
US /ˈvɜːr.vɪt ˌmʌŋ.ki/
UK /ˈvɜːr.vɪt ˌmʌŋ.ki/

1.
a small, agile, and highly social monkey (Chlorocebus pygerythrus) native to Africa, known for its grey fur, black face, and distinctive blue testicles in males.
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A troop of vervet monkeys was observed foraging near the campsite.
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The male vervet monkey displayed its bright blue testicles as a sign of dominance.