A gif with relatively little motion, meaning there's lots of compression possibilities:

• modern times.gif animated gif, 2.1 MB
• modern times-frames.png individual frames, sorted by width, height, frame 5.2 MB
• modern times-timeswapped.png individual frames, sorted by frames, width, height 1.8 MB
• modern times-timeswapped-morton.png individual frames, projected through z-curve, sorted by frames, width, height 1.6 MB

A gif with more motion, making compression slightly more difficult:

• full metal jacket.gif animated gif, 511,7 kB
• full metal jacket.png individual frames, sorted by width, height, frame 1,8 MB
• full metal jacket-timeswapped.png individual frames, sorted by frames, width, height 989,4 kB
• full metal jacket-timeswapped-morton.png individual frames, projected through z-curve, sorted by frames, width, height 867,9 kB

A gif with a lots of motion and individual pixels changing, making compression difficult:

• eraserhead.gif animated gif, 504,2 kB
• eraserhead.png individual frames, sorted by width, height, frame 718,7 kB
• eraserhead-timeswapped.png individual frames, sorted by frames, width, height 617 kB
• eraserhead-timeswapped-morton.png individual frames, projected through z-curve, sorted by frames, width, height 584,7 kB