A perfectly preserved 72-million-year-old duck-billed dinosaur has been discovered in Japan.
The crested creature has been described as one of the best dinosaur fossils ever found.
It includes the skull, jaw bones, spine, ribs and teeth - as well as the back and front legs.
The discovery also indicates Asia and the United States were joined by land in the age of the dinosaurs.
Corresponding author Professor Yoshitsugu Kobayashi said: "It is rare and pretty astonishing to find an almost complete skeleton.
"There is no doubt that this is the best preserved large dinosaur skeleton from Japan."
It has been named Kamuysaurus japonicus after a spiritual being worshipped by people on Hokkaido Island where it was dug up.
The plant eater was more duck-billed than most with a face like a shovel at the end of a long neck.
It was 26-feet long and weighed more than five tonnes.
It was at least nine years old at the time of its death, meaning it was still a juvenile, and it had a thin, bony crest on its head - a feature of the hadrosaur family to which it belonged.
Kamuysaurus was a member of the species known as Edmontosaurus that roamed Earth during the Late Cretaceous.
They inhabited North America with fossils found in places such as Montana, Nebraska and New Jersey.
Genetic analysis found it is closely related to the dinosaurs Kerberosaurus and Laiyangosaurus from Russia and China, respectively.
Comparing it with 70 other hadrosaurs also detected so many unique characteristics that it was identified as a dinosaur completely new to science.
Its discovery in marine sediment adds to evidence that hadrosaurs, although spending most of their time on land, liked to live by water.
They were among the most successful and diverse group of dinosaurs. They were large bodied with stiff tails.
They had specialised jaws and teeth that enabled them to grind down tough ferns and leaves. The front of the snout was flattened, like a duck's bill.
They walked on all fours. Some had elaborate crests and other headgear, possibly for attracting mates.
Co author Dr Anthony Fiorillo, chief curator at the Perot Museum of Nature and Science in Texas, said: "This discovery is not only significant for the people of Hokkaido and all of Japan.
"It has global significance because this dinosaur shows us how the world has been connected through time.
"Kamuysaurus is closely related to the animal we study from Alaska, Edmontosaurus, a duck-billed dinosaur also found throughout much of western North America.
"Because these dinosaurs are so closely related, they provide further evidence that long ago, Asia and North America were connected."
Known as the Bering Land Bridge, it ran between Siberia and Alaska. It has been described as 'a dinosaur migration highway'.
The first 13 ribs of Kamuysaurus were stumbled upon by a local resident in 2003. They were originally thought to belong to a prehistoric sea creature called a plesiosaur.
It was only eight years later that it was identified as a dinosaur.
So professor Kobayashi's team carried out two expeditions to the fossil site in 2013 and 2014.
While exploring the same hill, they came across so many more bones they were able to perform a total reconstruction.
The preparation has taken nearly a decade, with the help of a large number of volunteers. Many miscellaneous bones remain to be identified.
Dr Fiorillo added: "But the fossils clearly demonstrate this is a nearly complete skeleton including multiple skull elements and a nearly complete series of vertebrae and fore and hind limbs."
