Darren Naish, in his blog Tetrapod Zoology, calls attention to a new paper on what may have been the largest animal ever to walk the Earth. A discovery from 1878 has been reexamined. Result: "Based only on a single enormous vertebra, now lost, Amphicoelias fragillimus has been estimated to have reached a length of 60 m and may have attained a weight of 150 tons!" Naish notes, "If these estimates are valid, then this animal was twice as long as Supersaurus and Diplodocus, and perhaps over four times heavier."
Not so incidentally, Naish's must-read blog is moving to: