Well, you can make your own (i guess most use GIMP) or google "animated .gifs" because that's what the moving pics are- .gif files!
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you can also use gifninja.com
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A moving image file is stored in a .GIF format. You can find lots of them online just by Googling whatever you're looking for and tacking the word GIF on the end, or you can make your own gif's using an editor such as GIMP.
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