Or the webm:
auto-selects best format for browser, reverts to GIF where required.
Slower. For "gif only" areas (eg
<iframe src="http://gfycat.com/ifr/WideeyedTinyArthropods" frameborder="0" scrolling="no" width="480" height="270" style="-webkit-backface-visibility: hidden;-webkit-transform: scale(1);" ></iframe>
<img class="gfyitem" data-id="WideeyedTinyArthropods" />
4.2 to 1
(Bandwidth saved: 27G)