Last time when i login to twitter i saw an image of twitter fail but that was not a fail whale. Fail whale is an indication of twitter fail. Ever tweeters frighten from fail whale because the network got disconnect and tweeters no longer be friends. As fail whale got a scary gesture, the new image is a
bird (I think it is called to be fail bird). As previous twitter bird fail was dead twitter bird, it was quiet scary for tweeters.