Would you love to have your SatyrFarm land animals walk on GROUND level, up hills and down slopes ?
Then change your animal.lsl script:
on line 630 find v.z = cp.z;
change it like this
v.z = llGround(ZERO_VECTOR);
cp.z = llGround(ZERO_VECTOR);
//v.z = cp.z;
Now this is what I call natural behavior for land animals on ground level - (do NOT change your script to let them walk on a PRIM surface such as a skybox)