修改动画的猪，蜘蛛，大象，长颈鹿，马，和蜥蜴的腿。
Reworked animations for pig, spider, elephant, giraffe, horse, and lizard legs.
这只是大体的形态，粒子数也不够，后面会继续增加细节和修改动画。
This is still too far from what I want, for now the particle count isn't anywhere close to the final, will increase that later on and tweak the motion further.
因此现在我们能够按比例修改动画——忽略关键桢0，如果不使用差额按比例修改角度，这应该接近0。
So now we can scale the animation - ignore key frame 0, this should be close to zero, if not use the difference to scale the Angle.
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