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Predatory Dinosaur Fed on Smaller Versions of Itself

Science & Tech  (tags: archaeology, paleontology, discovery, dinosaurs, research, science )

- 2118 days ago -
Paleontologists have found evidence inside the stomachs of two fossilized dinosaurs of the species Sinocalliopteryx gigas that suggests the raptor-like predator did not shy away from feeding on its own kind, hunting small flying dinosaurs for food.

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Michael O (176)
Friday August 31, 2012, 8:54 pm
The researchers found the fossilized remains of two undigested dinosaurs of the species Confuciusornis sanctus and a third herbivorous, bird-like dinosaur inside the stomach of a Sinocalliopteryx, a feathered, non-flying carnivorous dinosaur about the size of a wolf that could reach lengths of up to 2.3 metres.

Confuciusornis were some of the earliest examples of birds, with skeletons and muscles that crudely resembled those of modern-day birds.

"The fact that this Sinocalliopteryx had not one but three undigested birds in its stomach indicates it was a voracious eater and a very active hunter," said University of Alberta paleontology student Scott Persons in a press release.

Persons is a co-author of a paper on the find published this week in the open-access journal PLoS One.

The abdominal cavity of a second Sinocalliopteryx was found to contain a partial leg of a bird-like dinosaur called Sinornithosaurus that the researchers estimate was roughly one-metre long in total.

"Sinornithosaurus is a relative of Velociraptor, which means this is the first direct evidence of a raptor becoming another predatory dinosaur's meal," Persons said in the release.

The researchers write in their paper that although they can't say definitively whether the metre-long bird ended up in the Sinocalliopteryx's stomach as a result of being actively hunted or passively scavenged, "if the Sinornithosaurus was predated upon (rather than scavenged), this would imply Sinocalliopteryx was capable of tackling carnivorous prey more than a third its own size."

Sinocalliopteryx dinosaurs lived in the Early Cretaceous period (which roughly spans from 145 million to 100 million years ago) and were first described by a group of paleontologists from the Chinese Academy of Geological Sciences in 2007. One of the Sinocalliopteryx specimens whose stomach contents the Alberta researchers examined was the one originally described by the Chinese scientists.

The Sinocalliopteryx did not have wings or the physical characteristics to be able to climb trees, but they were covered with a feather-like fuzz that kept their body temperature warm and their metabolism high, meaning they required a lot of food to survive and had to be stealthy hunters.

The researchers suggest in their paper that evidence of the Sinocalliopteryx's high metabolic rate can be seen in the fossilized stomach contents they examined.

The delicate bones of small bird-like dinosaurs like the Confuciusornis don't take long to digest so the fact that the stomach of one dinosaur contained the bones of three such creatures all undigested suggests the birds were consumed "in fairly rapid succession," the researchers write.

The rapid consumption of the birds also suggests they were actively hunted rather than simply scavenged, the researchers say.

The skeletons of the two dinosaurs were found in Liaoning province in northeastern China and analyzed with the co-operation of researchers from Alberta's Pipestone Creek Dinosaur Initiative and the Chinese Academy of Geological Sciences.

The region where the fossils were found, called the Lower Cretaceous Yixian Formation, is known for having some of the best-preserved dinosaur remains in the world owing to its rich volcanic sedimentary deposits.


John B (185)
Friday August 31, 2012, 9:46 pm
Thanks Michael for the link to the CBC article. A very interesting read. Read and noted.

Past Member (0)
Saturday September 1, 2012, 3:45 am

Roger G (154)
Saturday September 1, 2012, 4:17 pm
noted thanks !

Kimberly McMahen (25)
Sunday September 2, 2012, 9:00 am
Well, technically and evolutionary speaking, don't we all feed on our relatives?

paul m (93)
Sunday September 2, 2012, 9:18 am


paula eaton (30)
Sunday September 2, 2012, 10:37 am

Sue Matheson (79)
Sunday September 2, 2012, 10:39 am
not surprising. thanks.

Talya H (10)
Sunday September 2, 2012, 5:18 pm
Thanks for the info! Not surprised at what a carnivore will eat :P

Muriel Servaege (53)
Monday September 3, 2012, 3:00 pm
TY Michael. Interesting article.

Crystal C (7)
Tuesday September 4, 2012, 5:31 am
Noted. That's so cool! I love learning about dinosaurs, so this was the perfect thing for me to read. I always have trouble reading their names though (haha, they are long, and complex). I wasn't too surprised at what he ate, just more surprised at the dinosaur that ate it. Thanks for this interesting article. It was fun to read, and find out more.

David Menard (43)
Tuesday September 4, 2012, 9:54 am
Not surprised. Just like the way 1% preys on the 99% history repeats

Phillipa W (199)
Tuesday September 4, 2012, 11:58 am

Robert O (12)
Tuesday September 4, 2012, 9:51 pm
Very interesting. Thanks Michael.

Sergio Padilla (65)
Sunday September 9, 2012, 4:57 pm
Thank you, interesting!

Reuben Ng (1)
Monday September 10, 2012, 4:34 am
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