Say Goodnight Gracie

When my son turned 1, he was given a gift by my Aunt and Uncle. I always remember this gift because it is a light activated animal puzzle. When you take the piece out it moos, woofs, meows, oinks, and cock-a-doodle-doos per its corresponding animals. My Aunt laughed when I opened it and made the comment she was pretty sure I might not appreciate this as much as Bear would. Well 6 years later, the puzzle is still alive and well, even though various attempts have been made on its life. All but one piece have survived and it can not be found. See if you can guess which one it is. (This by the way is how G is greeted and goodnighted every night/morning whenever we turn the lights on or off. Enjoy.