Python blit doesn't do animated automatically, must I blit each frame?

Hi,

I finally got Python images to be plopped on the screen, just blitting, a lonely mutalisk, but not flapping.
To make my mutalisk flap its wings in python, or any of my many animated GIF's, for that matter, must I blit them frame by frame? I was surprised it wasn't automatic flapping, like in other situations.

Here is the blit code that finally worked. . .
here

Thanks