Donald Duck comics by Don Rosa Easter Egg - Mickey's Head

After the flood of Xanadu has begun; Donald, Donald's nephews and Scrooge McDuck go to a palace to look for some metal, an old duck led them to the room where the metal is kept. When they still go down the stairs to the room and Scrooge McDuck is too happy, look closely, below Scrooge and one of Donald's nephews there is a bat with Mickey's head.