Beishanlong is one of the biggest,if not the biggest of all Ornithomimosaurids. The only bigger is the elusive deinocheirus,if it was a ornithomimosaur. Beishanlong was ca 7 to 8 metres long and was more primitive than later ornithomimids. It had not as long legs,hands and arms than the later ornithomimosaurs and was more massive built.
