What is the biggest hadrosaur?

Answer 1

Shantungosaurus (from China)is officially the biggest hadrosaur,but a new species called Zhuchengosaurus (from China aswell) could possibly be bigger.

Answer 2

The biggest hadrosaur is likely either Shantungosaurus or Parasaurolophus. Shantungosaurus is estimated to have been around 50 feet long and weighed up to 16 tons, while Parasaurolophus is estimated to have been around 40 feet long and weighed up to 4 tons.