Cut out two wings (each about 4 1/2 inches long) from black construction paper.
Glue the wings on to the outside rim of one egg cup. Glue one end of yarn onto the inside of the same egg cup.
Let the wings and yarn dry for 30 minutes.
Glue the rim of the second cup onto the rim of the first cup to complete the bat's body. Let dry an hour.
Glue on button eyes and a red paper mouth. Let dry 15 minutes. Hang your bat by the yarn.