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Who wins?
Sun Bear 4 (66.7%)
Raptorex kriegsteini 2 (33.3%)
Total Votes: 6
Sun Bear v Raptorex kriegsteini
Topic Started: Mar 10 2014, 04:04 PM (1,521 Views)
Taipan
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Sun Bear - Ursus malayanus
The sun bear (Ursus malayanus), sometimes known as the honey bear, is a bear found primarily in the tropical rainforests of Southeast Asia; North-East India, Bangladesh, Myanmar, Thailand, Laos, Cambodia, Vietnam, Southern China, Peninsular Malaysia, and the islands of Sumatra and Borneo. The sun bear is 120–150 cm (47–60 in) long, making it the smallest member in the bear family (Ursidae). Males tend to be 10–45% larger than females; the former normally weigh between 30 and 70 kg (66–154 lb), and the latter between 20 and 40 kg (44–88 lb). The shoulder height is about 60–72 cm (24–28 in). The sun bear possesses sickle-shaped claws that are relatively light in weight. It has large paws with naked soles, probably to assist in climbing. Its inward-turned feet make the bear's walk pigeon toed, but it is an excellent climber. The diet of the sun bear consists mainly of invertebrates and fruits but as omnivores they will eat a wide variety of foods including small vertebrates, such as lizards, birds, and turtles, eggs, the young tips of palm trees, nests of bees, berries, sprouts, roots, and coconuts. In fact, sun bears have been observed to eat over 100 insect species and over 50 plant species.

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Raptorex kriegsteini
Raptorex is a genus of primitive tyrannosauroid dinosaur, similar to (but much smaller than) later tyrannosaurids such as Tyrannosaurus rex. Its fossil remains consist of a single specimen uncovered in the lower Yixian Formation of northeastern China, dated to approximately 125 million years ago during the early Cretaceous period. The type species is R. kriegsteini, described in 2009 by Sereno et. al. The genus name is derived from Latin, raptor, "robber", and rex, "king". The specific name honours the parents of Henry Kriegstein, who donated the specimen, survivors of the Holocaust. Raptorex shows the same basic proportions as later tyrannosauroids: a comparatively large and solidly-constructed skull, long legs with adaptations for running, and tiny, two-fingered forelimbs. This is in contrast with more basal, contemporary tyrannosauroids such as Dilong, which retained features characteristic of more basal other coelurosaurs such as a small head and long, three-fingered forelimbs. Despite its similarity to later, giant tyrannosaurs, Raptorex was comparatively very small, estimated at 3 m (10 ft) long and about 65 kg (143 lb). The holotype (LH PV18) measured about 2.5 m (8 ft) and died in its sixth year.

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ARM0R
Mar 10 2014, 05:46 AM
Sun bear vs Raptorex?
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Vobby
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Omnivore
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This could be a very very interesting match, but there are authors that have pointed out the fact that Raptorex may very likely be a juvenile:

http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0021376
Abstract

The carnivorous Tyrannosauridae are among the most iconic dinosaurs: typified by large body size, tiny forelimbs, and massive robust skulls with laterally thickened teeth. The recently described small-bodied tyrannosaurid Raptorex kreigsteini is exceptional as its discovery proposes that many of the distinctive anatomical traits of derived tyrannosaurids were acquired in the Early Cretaceous, before the evolution of large body size. This inference depends on two core interpretations: that the holotype (LH PV18) derives from the Lower Cretaceous of China, and that despite its small size, it is a subadult or young adult. Here we show that the published data is equivocal regarding stratigraphic position and that ontogenetic reanalysis shows there is no reason to conclude that LH PV18 has reached this level of maturity. The probable juvenile status of LH PV18 makes its use as a holotype unreliable, since diagnostic features of Raptorex may be symptomatic of its immature status, rather than its actual phylogenetic position. These findings are consistent with the original sale description of LH PV18 as a juvenile Tarbosaurus from the Upper Cretaceous of Mongolia. Consequently, we suggest that there is currently no evidence to support the conclusion that tyrannosaurid skeletal design first evolved in the Early Cretaceous at small body size.


We could decide to still use the juvenile specimen for the match, since it was likely already able to hunt and fight, but its not complete development may make the fight unfair. Given parity weight, I think I would slightly favour the bear also if the holotype is an adult, but the little dimensions normally achieved by the sun bear should lead the theropod to victory.
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Carcharadon
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Shark Toothed Reptile
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Well the cladogram by Loewen et al. 2013 shows raptorex to actually be outside of tyrannosauridae:
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Edited by Carcharadon, Mar 11 2014, 07:37 AM.
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blaze
Carnivore
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That's is a common occurrence when you put "baby" theropods in a phylogentic analysis, they show as more primitive, given the lack of diagnostic characters, which appear later in ontogeny.
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retic
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snake and dinosaur enthusiast
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close match up. while raptorex is larger, the sun bear has a greater variety of weaponry. 50/50.
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