From: Dinosaurs as kangaroos and T-rex the Pop Icon by David Bressan at History of Geology
Original Source: Charles R. Knight’s (1896) “Laelaps” in The American naturalist, Volume 1 (image in public domain).
As an antidote to early stereotypes of lumbering, dim-witted dinosaurs, Charles Knight depicted the extinct reptiles as active creatures. “Leaping Laeleps” (1897) drew inspiration from Kangaroo behavior.