Natural History Museum, Berlin
The Giraffatitan was recovered by Werner Janensch betwen 1901 and 1913. The skeleton is about 12 to 13 m long and would have weighed 55 tons. Giraffatitan was for many decades called "the largest dinosaur" but there are recent discoveries of even larger dinosaurs. Giant titanosaurians appear to have passed Giraffatitan in sheer mass. Also, the sauropod dinosaur Sauroposeidon is estimated to be taller and possibly heavier than Giraffatitan.