Birds are the modern incarnation of dinosaurs.

But some modern birds live in ways that we haven't observed in the dinosaur kingdom. Ducks, for example, alternate between water and land habitats, able to take advantage of both.

Until now, that hadn't been seen in dinosaurs, but the discovery of a duck-like dinosaur from Mongolia may change that.

The new dinosaur, named Halszkaraptor escuilliei, was announced today in the journal Nature.

The remarkably complete fossil skeleton that paleontologists analysed indicates that this was likely a semi-aquatic dinosaur, able to both swim and to move about on land.

"This is the first dinosaur with a lifestyle similar to aquatic birds: this indicates that these dinosaurs were able to exploit an environment that was not considered in our previous interpretation of dinosaur history," Andrea Cau, a paleontologist at the Giovanni Capellini Geological Museum of the University of Bologna and lead author of the paper, said in an email.

(Lukas Panzarin)

This finding helps establish a new subfamily of similar dinosaurs, according to the paper. Several other fossil specimens from the same region fit into this family, indicating they're part of the same small branch on the evolutionary tree.

The discovery "illustrates how much of the diversity of Dinosauria remains undiscovered, even in intensely studied regions such as Mongolia," the authors wrote in the paper.

For this discovery, researchers used a scanning method that Cau described as "the most advanced scanning technology ever done on a fossil" to collect about 6,000 GB of data on the fossil while it was still partially embedded in rock.

The dinosaur dates back between 71 and 75 million years.

It's hard to prove this was definitely a semi-aquatic creature, but the specimen has a number of features that match those of semi- and fully aquatic reptiles and birds.

It had arms with structures similar to those that aquatic birds like penguins use to swim. And it had a neck like a goose with rows of teeth inside its mouth.

But instead of webbed feet, it had claws and toes like those of theropod family, which includes velociraptors and Tyrannosaurus Rex.

The dinosaur likely fed on fish, crustaceans, and small reptiles and mammals, according to Cau. The other members of this subfamily would have been a similar size.

The finding shows that there's still plenty of new history to be revealed as paleontologists scour the Earth for remains of the past.

This article was originally published by Business Insider.