(Science Daily News)
Blood is manufactured in bone marrow in a high energy process.
A bone has a small hole (foramen) in the side where the blood supply comes in to feed that process.
Professor Seymour compared bone holes in many creatures, adjusted for body size, and found the bigger the hole, the more energy they burned per pound. Modern mammals have ten times bigger blood supply holes than modern reptiles. But ten species of ancient dinosaurs all had bigger holes than modern mammals.
|A hole in the femur ofCentrosaurus apertus,|
a ceratopsian dinosaur.
Suggested by Brian Hall