Yeah, I couldn't figure out why either. The cycle went turtle, pig, pig, turtle, pig, pig.
Maybe it's alpabetical now. Since they removed the "Rank 1" from the spell name in the spell book.
Pig
Sheep
Turtle
Maybe? I have no idea...
I did also have to change my macro for my other animals too.
Used to be listed as "Polymorph(Rank 1: Turtle)". That didn't work anymore. Now it's just "Polymorph(Turtle)". Same with the Pig.
One last comment - I wish I could do both sheep and penguin. :(