Feline Grace

Note: This ONLY works in catform. So don't go throwing your kodo off a cliff because you're a cow with cat-like grace. Please.

Nivrax's reply has inspired me to do more testing regarding how much damage Feline Grace was reducing. Each Test # was done in different locations, I've decided to leave out the exact description and direction I was facing when falling for each test to avoid making this post too long. Feral form when mentioned refers to feral cat form.

Level 70 Tauren Druid
12310 Total Health

Test #1:
Normal Tauren Form:
1761 (14.31% of Total Health), 1633 (13.27%), 1723 (13.99%)
Average 1705.7 (13.86%)

Feral Form:
0 (0% of Total Health)
Reduction: At least 13.86%

Test #2:
Normal Tauren Form:
3149 (25.58% of Total Health), 3199 (25.99%), 3157 (25.65%)
Average 3168.3 (25.74%)

Feral Form:
0 (0% of Total Health)
Reduction: At least 25.74%

Test #3:
Normal Tauren Form:
3971 (32.26% of Total Health), 4016 (32.62%), 4017 (32.62%)
Average 4001.3 (32.50%)

Feral Form:
315 (02.56% of Total Health), 369 (03.00%), 346 (02.81%)
Average 343.3 (02.79%)
Reduction: 32.50% - 02.79% = 29.71%

Test #4:
Normal Tauren Form:
6326 (51.39% of Total Health), 6335 (51.46%), 6353 (51.61%)
Average 6338.0 (51.49%)

Feral Form:
2751 (22.35% of Total Health), 2716 (22.06%), 2866 (23.28%)
Average 2777.7 (22.56%)
Reduction: 51.49% - 22.56% = 28.93%

Test #5:
Normal Tauren Form:
6839 (55.56% of Total Health), 6957 (56.52%), 6768 (54.98%)
Average 6854.7 (55.68%)

Feral Form:
3079 (25.01% of Total Health), 3133 (25.45%), 3043 (24.72%)
Average 3085.0 (25.06%)
Reduction: 55.68% - 25.06% = 30.62%

Conclusion
In the first two tests (#1, #2) no damage was taken when in feral form. In the last three tests (#3, #4, #5), we came up with the damage being reduced by 29.71%, 28.93%, 30.62%.

If we average these three, we get 29.75% reduced health damage. To be clear, this does not mean falling damage is reduced by 29.75% percent, but rather falling damage is reduced by 29.75% of your current max health. Thus, of course, if the falling damage was suppose to be less than 29.75% of your current max health, you'll receive no damage in feral form.

Thus, we can conclude from these tests, Feline Grace reduces falling damage by around 30% of your current max health.

In case someone else is curious if this will reduce the fall damage enough to survive a jump from Aldor rise: It doesn't :-(