A giant extinct kangaroo that lived in the Australian outback 100,000 years ago would have walked rather than hopped, research has shown.

Scientists said the 2.7-metre-tall creature, which had a round rabbit-like face, would have been an unnerving sight as it strode around on two legs.

The ‘short-faced’ sthenurine weighed as much as 250kg and was three times the size of the largest present-day kangaroos.

Scientists who conducted a detailed study of its anatomy believe the marsupial was just too heavy to hop.

“I don’t think they could have gotten that large unless they were walking,” said lead researcher Christine Janis, from Brown University in Providence, the US.

The team analysed bones from more than 140 past and present kangaroo and wallaby skeletons, making nearly 100 measurements of each animal.

Unlike large modern red and grey kangaroos, sthenurines lacked specialised features geared for rapid hopping. Yet their bone structure indicated they had an upright posture and were able to support their weight on one foot at a time.

The creatures had large hips and knees and stable ankle joints that would have helped them walk on two legs.

Their hands were poorly suited for moving on all fours, but adapted for foraging.

An artist’s impression of an extinct sthenurine kangaroo that would have walked rather than hopped. Photo: Brian Regal/Brown University/PA WireAn artist’s impression of an extinct sthenurine kangaroo that would have walked rather than hopped. Photo: Brian Regal/Brown University/PA Wire

“People often interpret the behaviour of extinct animals as resembling that of the ones known today, but how would we interpret a giraffe or an elephant known only from the fossil record?” said Janis. “We need to consider that extinct animals may have been doing something different from any of the living forms, and the bony anatomy provides great clues.”

The research is reported in the online journal Public Library of Science One.

Whether or not reliance on walking rather than faster and more efficient hopping led to sthenurines becoming extinct about 30,000 years ago is unknown.

Janis said they may have struggled to elude human hunters, or been unable to migrate far enough to find food as the climate became more arid.

Sign up to our free newsletters

Get the best updates straight to your inbox:
Please select at least one mailing list.

You can unsubscribe at any time by clicking the link in the footer of our emails. We use Mailchimp as our marketing platform. By subscribing, you acknowledge that your information will be transferred to Mailchimp for processing.