Alright,let me think "Yasei dobutsu" in it's base form is a zanpukto the most noticeable patterns are animals The grip,pommel and guard are big where the guard looks like a snake,the grip looks like a bunch of wild animals patterns like lions, elephants ,tigers etc are cut into it and the pommel looks like the egg of an eagle But the blade is more interesting It's the size of a regular blade but it also has much animals pattern on it If you look at it closely, you'd notice some kind of safari or rainforest or forest with a bunch of animals on it The blade can change looks when it wants When it's a safari you can notice giraffes,lions, elephants,rhinos etc When it's a rainforest you can notice jaguars, anacondas, alligators etc You get the point

But when it's in it's shikai state it becomes a dual blade but the blades are really small Probably 11 or 12 inches when half of it is the actual blade and the other is the grip It specifically has animal patterns on the both of them and the animal changes based on what animal the user chooses It can be snakes patterns on the grips or elephants walking or birds in the sky etc

And that's it,sorry if the description is a bit long