Blog Post Image: Were Dinosaurs Cold-Blooded or Warm-Blooded? Neither, Study Finds

Growth rates across an evolutionary tree. Dinosaurs’ growth rates fall in between warm-blooded mammals and birds (endotherms) in red, and cold-blooded fish and reptiles (ectotherms) in blue. They are closest to living mesotherms such as tuna and leatherback turtles. Illustration courtesy of John Grady (Click image to enlarge)