John H. Ostrom (born 1928) is an American paleontologist who revolutionized modern understanding of dinosaurs in the 1960s, when he demonstrated that dinosaurs are more like big non-flying birds than they are like lizards (or "saurians"), an idea first proposed by Thomas Henry Huxley in the 1860s, but which had garnered few supporters. The first of Ostrom's broad-based reviews of the osteology and phylogeny of the primitive bird Archaeopteryx appeared in 1976. His reaction to the eventual discovery of feathered dinosaurs in China, after years of acrimonoius debate, was bittersweet (Gentile, 2000).

Ostrom is a professor at Yale University where he is currently the Curator Emeritus of Vertebrate Paleontology at the Peabody Museum of Natural History, which has an impressive fossil collection originally started by Othniel Charles Marsh.

Hot-blooded Deinonychus

His 1964 discovery of Deinonychus is considered one of the most important fossil finds in history [1]. Deinonychus, the first "raptor", was an active predator that clearly killed its prey by leaping and slashing with its "terrible claw". The conclusion that at least some dinosaurs had a high metabolism, and thus were at least partially warm-blooded, was popularized by his student Robert T. Bakker, and changed the impression of dinosaurs as cold-blooded, sluggish and slow lizards which had prevailed since the turn of the century.

This changed how dinosaurs are depicted by both professional dinosaur illustrators, and in the public eye. The find is also credited with triggering the "dinosaur renaissance", a term coined in a 1975 issue of Scientific American by Bakker to describe the renewed debates causing an influx of interest in paleontology, which has lasted from the 1970s to the present and has doubled recorded dinosaur diversity.

Archaeopteryx and the origin of flight, and hadrosaur herds

Ostrom's interest in the dinosaur-bird connection started with his study of what is now known as the Haarlem Archaeopteryx. Discovered in 1855, it was actually the first specimen recovered but labeled as Pterodactylus crassipes it languished in the Teylers Museum in the Netherlands until Ostrom's 1970 paper (and 1972 description) corrected identified it as one of only eight "first birds" (counting the solitary feather).

Ostrom's reading of fossilized Hadrosaurus trackways also led him to the conclusion that these duckbilled dinosaurs travelled in herds.

References

• "At Last, His Theory Flies". May 5, 2000. Olivia F. Gentile. Hartford Courant.
• "Archaeopteryx". May 1975. John H. Ostrom. Discovery, volume 11, number 1, pages 15 to 23.

External links

• Dinosaurs in Your Garden