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Head of a Bear remains one of only eight known Leonardo drawings in private hands (excluding those in the British Royal Collection and the Devonshire Collection). The 2021 sale was the first of a Leonardo drawing since Horse and Rider was sold, also at Christie's, in 2001 for £8.1 million (including fees). [2]
The femoral neck specifically, which connects the head of the femur to its primary shaft absorbs the force of impact when an upright biped assumes movement. [14] In Orrorin tugenensis , the orientation of the head condyles of the broadened femur is wider and thicker in comparison to that of chimpanzees and other great apes .
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Sauropod neck posture is a subject occasionally debated among scientists, with some favoring postures closer to horizontal whilst others a more upright posture. Research has looked at various avenues of evidence and analysis including: attempting to reconstruct the neutral posture of their necks and estimating range of motion by studying the ...
Most bipedal animals move with their backs close to horizontal, using a long tail to balance the weight of their bodies. The primate version of bipedalism is unusual because the back is close to upright (completely upright in humans), and the tail may be absent entirely. Many primates can stand upright on their hind legs without any support.
A bear that’s “overcome all odds” was caught on camera waddling about the woods in West Virginia on its two hind legs — thanks to a bizarre birth defect that left it with a pair of front nubs.