How do I make animated GIF's transparent background?

Hi,

Can anybody tell me how to make these animated GIF's a transparent background? - for a game.
an elephant, a cyborg and a yeti !
I have a MacBook 10.9yeti GIF
elephant
cyborg
 
Thanks
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beavoidAsked:
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Tom BeckCommented:
Do you have Adobe Fireworks? If so, you can use the Magic Wand tool to select the background then use Select -> Select Similar to catch any trapped areas of the same color. Then just use the Eraser tool with a hard edge and erase the background. Do this for each frame and re-save the file.

If there's an automated way to do this, I don't know about it. Fireworks allows you to record and replay actions from the History but in each frame, the selection will be different so it will not help much.

The Cyborg will be the easiest image to separate the figure from the background because of the contrast. The Yeti will be the most difficult since the dark areas of the Yeti blend with the dark background.
Cyborg with transparent background.
Paul SauvéRetiredCommented:
I used GIMP 2.8.14 (there is a free version for Mac):  yeti elephant cyborg
However, the results are not that good for the Elephant and the Yeti!

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