McDonald's Happy Meal web site confirms that the October 2015 kids' meal theme will be based on the current film Hotel Transylvania 2 (not The Nightmare Before Christmas, which was released back in in 1993).
There are differences in the shell textures of oysters and clams. The shell of a clam is smooth and shiny while an oyster has a rough outer shell. Both the organisms take in water through the shells but the filtering procedure is different. Oysters produce pearls which are in much demand but clams do not.
The average size for scallops are two to three inches, with the largest species being the deep-sea scallop at five or six inches across. Oysters and clams, on the other hand, can grow to be huge! The largest oyster discovered was around 15 inches, and giant clams can reach a whopping six feet in length.