The ratio of the femur to metatarsal length has often been used as an indicator of speed and cursoriality among mammals (GREGORY, 1912; OSBORN, 1929; HOWELL, 1944; BAKKER, 1983). Elongation and tapering of distal limb elements relative to the proximal section is thought to promote speed because limb length (and stride length) is increased without an unfavorable shift of the limb’s moment of inertia, because muscle mass remains concentrated near the proximal joint (HILDEBRAND & HURLEY, 1985). 在哺乳动物中，股骨与跖骨的长度之比经常被用作速度的指标。远端肢体的伸长和变细被认为可以提升速度，因为肢体长度(步幅长度)增加了，而由于肌肉质量仍然集中在近端关节附近，肢体的转动惯量没有发生不利的变化。
这是前后肢体肱骨/股骨，桡骨/胫骨，第三掌骨/跖骨长度的比例，依照此说法对比一下猫科成员的速度

关于大圆肌
HILDEBRAND (1985) showed that muscles could move the joints through wider angles and therefore contribute to the length of stride when they insert close to the joints than when they insert farther away. HILDEBRAND(1985)表明，大圆肌可以大角度关节，因此，肌肉靠近关节，比肌肉插入更远的关节有助于步幅的长度。 如下图狮子大圆肌相比老虎更接近关节，这是狮子提升速度的又一个优势，表格第二列为大圆肌在肱骨上的附着长度与肱骨长度比值，这里印刷错误，分子和分母位置反了，下图白色方块为大圆肌在肩胛骨上的相对附着长度，狮虎相当但是该研究测量的狮子肩胛骨更大，实际附着长度仍然是狮子大于虎

Moreover, relatively long posterior limbs have been found to be an indicator of good jumping skills, when compared to the length of the anterior limbs (HOWELL, 1944). Another important indicator for the leaping ability is said to be the length of the calcaneus (TURNER, 1996). 前后肢之比是一个良好的衡量跳跃的指标。另一个衡量跳跃能力的重要指标是跟骨的长度。狮子与老虎前后肢之比如下图一份样本更充足的研究世界之虎一书也是因此认为老虎跳跃强于狮子
根骨与胫骨比例如下图补充一点其他的根骨数据

@中恐狮王

临时有事，先发这么些吧，零散的东西以后再补充

顶

贝贝跃

厉害了

再补充一份根骨测量

科普文

a