Thx for replies.@Mr FeltzerBasically you extract the images out of the Fallout critters.dat, convert them to gifs and/or bmp-files and after this the most work is done in Photoshop or a similar program. Here you have to put all the images into the right order and save each frame of the animation as separate image file. After doing this you put all the single files together with some gif-animation tool. This gif, for example has about 165 single frames ...
Wow Cool, Id Like to know how that was Made.