Remember the Subsurfaces from the last step ? And remember that the snake had always the same grinning facial expression ? Now, let's make some animated sprites¹⁾ - not pygame sprites, but surfaces that show different images of an animation cycle, like a bird flapping it wings.

Instead of painting all the single pictures of an animation cycle myself i prefer to use ready-made sprite sheets. In the data folder, you will find a spritesheet²⁾ from http://www.flyingyogi.com showing several pictures of an animal.

With the help of pygame's subsurface command, i will show you how to extract single images from the sprite sheet and use them.