Hieroglyphics of Horapollo: Book II.: LXVII. How a Man That Conceals His Own Defects
Hieroglyphics of Horapollo, tr. Alexander Turner Cory, [1840]
When they would symbolise a man that conceals his own defects, they depict AN APE 1 MAKING WATER; for when he makes water he conceals his urine.
127:1 Pier. mentions a reading, αἴλουρον "a cat."