@exoteric: Hi, I'm the video supervisor of Media Acquisitions. Actually, all the videos you see on the Bing Homepage are, in fact, videos not animations (.gifs or otherwise). Some originate from footage, others from still images. Both types end up as very small video files, looping on the page. With still images, my motion graphics artist uses advanced 3D tools to create movement where there originally was none. As long as it keeps you guessing, that's half the fun!