Blood in 115-Million-Year-Old Dinosaur Fossil in Ceará Links Dinosaurs to Humans

Researchers found blood in a 115-million-year-old dinosaur fossil in Ceará, Brazil, proving dinosaurs had warm blood like birds and mammals, not reptiles. This discovery, published in PNAS, offers unprecedented insight into prehistoric physiology. The international team, led by Kliti Grice of Curtin University, identified preserved red blood cells, mineralized collagen amino acids, and intact heme molecules within vascular channels. This marks the first chemical proof of hemoglobin-derived molecules in dinosaur cells, confirming warm-blooded metabolism enabled active lifestyles regardless of climate. The Aratasaurus museunacionali fossil, discovered in 2008 and surviving the 2018 National Museum fire, was named meaning "lizard born from fire." The research used millimeter-sized fossil fragments, potentially advancing knowledge about organic molecule preservation beyond paleontology.