Although hyenas lack perineal scent glands, they have a large pouch of naked skin located at the anal opening. Large anal glands above the anus open into this pouch. Several sebaceous glands are present between the openings of the anal glands and above them. These glands produce a white, creamy secretion that the hyenas paste onto grass stalks. The odour of this secretion is very strong, smelling of boiling cheap soap or burning, and can be detected by humans several metres downwind. The secretions are primarily used for territorial marking, though both the aardwolf and the striped hyena will spray them when attacked.