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Bambiraptor - Video Learning - WizScience.com
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WIKIPEDIA ARTICLE

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Bambiraptor
Temporal range: Late Cretaceous, 72 Ma
Dans l'ombre des dinosaures - Bambiraptor jeune - 04.jpg
Restored skeleton of the juvenile specimen
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Order: Saurischia
Suborder: Theropoda
Family: Dromaeosauridae
Clade: Eudromaeosauria
Subfamily: Saurornitholestinae
Genus: Bambiraptor
Burnham et al., 2000
Type species
Bambiraptor feinbergi
Burnham et al., 2000

Bambiraptor is a Late Cretaceous, 72-million-year-old, bird-like dromaeosaurid theropod dinosaur described by scientists at the University of Kansas, Yale University, and the University of New Orleans.

The holotype fossil is less than one meter long, although this specimen appears to be a juvenile,[1] and it is possible that Bambiraptor is really just a juvenile Saurornitholestes. Because of its small size, it was named Bambiraptor feinbergi, after the familiar Disney movie character, the name literally translates to "Bambi thief" and the surname of the wealthy family who bought and lent the specimen to the new Graves Museum of Natural History in Florida.

Discovery[edit]

Cast of the fossil slab

The Bambiraptor skeleton was discovered in 1993 by 14-year-old fossil hunter Wes Linster, who was looking for dinosaur bones with his parents near Glacier National Park in Montana, United States. Linster told Time Magazine that he uncovered the skeleton on a tall hill and was amazed at his discovery. "I bolted down the hill to get my mom because I knew I shouldn't be messing with it", he said. The bones that Linster discovered on that hilltop led to the excavation of a skeleton that was approximately 95 percent complete. Because of its completeness Florida Paleontology Institute Director Martin Shugar compared it to the 'Rosetta Stone' that enabled archaeologists to translate Egyptian hieroglyphics. Yale paleontologist John Ostrom, who reintroduced the theory of bird evolution from dinosaurs after his 1964 discovery of Deinonychus in Wyoming, agreed, calling the specimen a "jewel", and telling reporters that the completeness and undistorted qualities of the bones should help scientists further understand the dinosaur-bird link.

The fossil first was seen as the young of Saurornitholestes and in 1997 reported as belonging to a Velociraptor sp.[2] In 2000 it was named and described by David Burnham, Kraig Derstler, Phil Currie, Robert Bakker, Zhou Zhonge and John Ostrom as a separate species: Bambiraptor feinbergi. The generic name is derived from Bambi, in reference to the young age of the specimen, and a Latin raptor, "seizer". The specific epithet honours Michael and Ann Feinberg who acquired the specimen from a fossil dealer and made it available to science.[3] In 2000 George Olshevsky suggested the emended epithet "feinbergorum", the plural genitive, and this was followed by some authors but such emendations are no longer allowed by the ICZN.

The holotype specimen AMNH FR 30556 (previously AMNH 001 and FIP 001, sometimes wrongly referred to as AMNH FR 30554), was uncovered in layers of the Upper Two Medicine Formation dating to the late Campanian. It is currently housed at the American Museum of Natural History, New York. It consists of a partially articulated largely complete skeleton with skull of a juvenile individual. Though the right side of the skeleton is damaged, most bones are uncompressed and well-preserved. The end of the tail is lacking. Also a paratype was assigned in 2000, FIP 002-136, consisting of thirty-four skeletal elements of at least two adult individuals found near the holotype. In 2004 an upper jaw bone was referred to the species, specimen MOR 553S-7-30-91-274.[4]

Description[edit]

Skeletal restoration

While adult specimens are known, only the type specimen, a juvenile, has been described. This juvenile Bambiraptor has a preserved length of 90 centimetres (3.0 ft),[5] and an estimated total length of one metre. It perhaps weighed only two kilograms (4.4 lb). In 2010 Gregory S. Paul estimated the adult length at 1.3 metres (4.3 ft), the weight at five kilogrammes.[6] It had long hindlimbs, indicating it could have been a fast runner. It also had very long arms and a well-developed wishbone.

Forelimbs[edit]

Restored skeleton in Oxford University Museum

Research done by Phil Senter of the Lamar State College in Orange, Texas has indicated that Bambiraptor may have had mutually opposable first and third fingers and a forelimb maneuverability that would allow the hand to reach its mouth.[7] This would have given the animal the ability to "hold" food in its front limbs and place it in its mouth, in a similar manner to some modern-day small mammals.[8]

Brain[edit]

Bambiraptor had a brain size in the lower range of modern birds. Because of its enlarged cerebellum, which may indicate higher agility and higher intelligence than other dromaeosaurs, David A. Burnham has hypothesized that Bambiraptor feinbergi may have been arboreal. Life in the trees may have required evolutionary pressure that resulted in a larger brain. Burnham also offers an alternative hypothesis that a larger brain could be selected for as a result of hunting more agile prey items such as lizards and mammals. The Bambiraptor holotype had with 14 cm³ the largest brain for its size of any dinosaur yet discovered, although the brain size may be due to its age, because juvenile animals tend to have larger brain-to-body ratios compared to adults.

Feathers[edit]

Artist's restoration of the juvenile specimen

During the conference where Bambiraptor was first introduced, the dinosaur reconstruction specialist Brian Cooley portrayed Bambiraptor as having feathers, despite the fact that no feathers were found with the fossil itself. His decision was influenced by the fact that because Bambiraptor within a cladistic analysis was a member of a group, Paraves, that contained feathered true birds and that was the sister taxon of Oviraptorosauria, a group that also had feathered forms (e.g. Caudipteryx), Bambiraptor most likely had feathers too due to phylogenetic bracketing. Most paleontologists support Cooley's view, and subsequent discoveries[citation needed] confirmed that small dromaeosaurid dinosaurs like Bambiraptor were fully covered in feathers (see Dromaeosauridae for more information).

Phylogeny[edit]

Bambiraptor was assigned to the Dromaeosauridae in 2000. Subsequent cladistic analyses differ in the position of Bambiraptor: it has been recovered in the Velociraptorinae, Microraptoria and most recently in the Saurornitholestinae.

See also[edit]

References[edit]

  1. ^ [1] Archived April 20, 2006, at the Wayback Machine.
  2. ^ Burnham, D.A., Derstler K.L. and Linster, W., 1997, "A new specimen of Velociraptor (Dinosauria: Theropoda) from the Two Medicine Formation of Montana", Dinofest International Proceedings. pp 73-75
  3. ^ Burnham, D.A., Derstler, K.L., Currie, P.J., Bakker, R.T., Zhou Z. & Ostrom J. H., 2000. "Remarkable new birdlike dinosaur (Theropoda: Maniraptora) from the Upper Cretaceous of Montana", University of Kansas Paleontological Contributions 13: 1-14
  4. ^ Burnham, D. A. (2004). "New Information on Bambiraptor feinbergi from the Late Cretaceous of Montana". In Philip J. Currie; E.B. Koppelhus; M.A. Shugar; J.L. Wright. Feathered Dragons: Studies on the Transition from Dinosaurs to Birds. Indianapolis: Indiana University Press. pp. 67–111. ISBN 0-253-34373-9. 
  5. ^ Holtz, Thomas R. Jr. (2011) Dinosaurs: The Most Complete, Up-to-Date Encyclopedia for Dinosaur Lovers of All Ages, ISBN 978-0375824197 Winter 2010 Appendix.
  6. ^ Paul, G.S., 2010, The Princeton Field Guide to Dinosaurs, Princeton University Press p. 135
  7. ^ Senter, P., 2006, "Comparison of forelimb function between Deinonychus and Bambiraptor (Theropoda: Dromaeosauridae)", Journal of Vertebrate Paleontology, 26(4): 897-906
  8. ^ [2] Archived September 30, 2007, at the Wayback Machine.

External links[edit]

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