Where does “àjàò” come from?

àjàò (Yoruba): rodents known as anomalures, specifically two species of rodent in genus Anomalurus that occur in Nigeria, Beecroft's flying squirrel (Anomalurus beecrofti) and Lord Derby's scaly-tailed squirrel (Anomalurus derbianus), not closely related to the better-known group of flying squirrels of the Sciurid