Mud is a small and skinny baboon with brown fur and soft dark brown eyes. His muscles are scrawny and underdeveloped.
Mud is a smart and intelligent baboon with a kind heart. According to Thorn , he doesn't have any violence within him. His weakness makes him an easy target for bullies such as Nut . Despite this, he always tries to avoid violence and simply ignores Nut instead. He never blames other for his own problems.
Mud is first seen talking with Thorn in their first Feat. Then Nut steals his egg, and Nut does not become a Lowleaf, though Thorn does. He kindly denies Thorn's offer to give him his egg.
Mud later brings Fearless back to the camp.