Red-Butt Monkeys vs Blue-Butt Monkeys: Which Species Are These? - AZ Animals
Drill monkeys make 'appeasement' faces when greeting each other to keep the peace. Although their faces are plain in color, their butts and genitals can be blue, red, and purple! : r/Awwducational
Red-Butt Monkeys vs Blue-Butt Monkeys: Which Species Are These? - AZ Animals