TABLE 2.

Velocities on knee and snout of Rana dybowskii and Xenopus laevis (Mean ± SD)

Time point	b	c	d	e	f
R.dybowskii
Knee velocity, m/s	0.0918 ± 0.02	0.0307 ± 0.01	0.0423 ± 0.01	0.0375 ± 0.01	0.0209 ± 0.008
Snout velocity, m/s	0.0712 ± 0.02	0.0303 ± 0.01	0.0373 ± 0.01	0.0173 ± 0.004	0.0102 ± 0.003
X.laevis
Knee velocity, m/s	0.0344 ± 0.008	0.0229 ± 0.003	0.0191 ± 0.006	0.0134 ± 0.004	/
Snout velocity, m/s	0.0337 ± 0.003	0.0266 ± 0.005	0.0152 ± 0.005	0.0106 ± 0.003	/

For Rana, b is the moment hindlimbs just leave the ground; c is the initial time of flight; d is the moment forelimbs hit the ground; e is the moment the body hits the ground; f is the moment all limbs land on ground. For Xenopus, b is the moment hindlimbs is about to leave; c is the moment hindlimbs just takeoff from the ground; d is the moment the body hits the ground; e is the moment whole body land on ground, and all limbs are about to rotate to recover preparation posture.