The rockette Tyrannosaurus. This was infamous for the pose due to being done while dinosaurs were still regarded as cold blooded slow moving animals. The reasoning behind it has not been made known, but nowadays such a pose is more believable for T. Rex.
Scott Hartman talked a bit more about it (and the usage of it as inspiration for the design he made for Permia) on his blog. Here’s the link: https://www.skeletaldrawing.com/home/rockette-tyrannosaurus-rex