Big Butts Can Lie: Bootylicious Baboons May Not Be Most Fertile | Live Science
3 monkeys with unusual colors | Bright red face, blue butt, orange mane… These colors are unusual for animals, but these 3 monkeys wear them well. 😏 | By Brut nature | Facebook
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: What Monkey Has A Red Bottom?
Red-Butt Monkeys vs Blue-Butt Monkeys: Which Species Are These? - AZ Animals
TIL: Why Do These Monkeys Have Big, Colorful Butts? | Today I Learned - YouTube