Sauropod dinosaurs grew to 25 metres or more in length and weighed several tonnes – but footprints in Texas seem to suggest they sometimes walked on just two legs
Source:
https://www.newscientist.com/article/2231408-dinosaur-tracks-seem-to-show-giant-sauropods-wading-on-two-front-legs/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home