1.
I find that animals always TRIES to jump over the walls.
Especially when I use wheat to lure sheeps or use Carrots to lure pigs.
Of course they failed,because They cann't jump over it...

They are expected NOT to try to jump,just as what they do when they are in fences.

I guess the Height of Wall is 1.5,but AI seem it as 1.
(It also appeared in PC version before 12w40a.)

2.
By NORMAL jump,they can't jump over walls
When I hit them near the wall,they will jump for been hit....But this time.they can even jump onto the wall!
Maybe some problem happens in Height of Walls.

3.
Also I find sometimes,Animals even can cross through the walls....
What's more,it seems that they are not be damaged for crossing this soild blocks...

After my test ,these problems NOT exist in fences

For every problems I prepare a picture.