CollectA DaxiatitanCollectA Daxiatitan CollectA Model 88704 Product Dimensions: 29 x 5 x 20. 8 cm Age: 3 years and up The Daxiatitan was an enormous long necked dinosaur known as a sauropod. Its impressive size made it one of the giants of the prehistoric world! With a body length of about 85 feet, it was as long as two school buses lined up end to end. The Daxiatitan had a super long neck that allowed it to reach high up into the trees to munch on leaves and branches.