Becoming-animal produces nothing but itself. The human being does not really 'become' an animal any more than the animal 'really' becomes something else. Is a false alternative if we say that you either imitate or you are.
Becoming-animal is not imitation. The painter and musician do not imitate the animal, they become-animal at the same time as the animal becomes what they willed. Becoming is always double, that which one becomes becomes no less than the one that becomes.
Becoming-animal is not imitating, but it is a question of making something that has to do with the crab enter into composition with the image.
Becoming-animal is a process occuring only molecularly. You do not become a barking molar dog, but by barking, you emit a molecular dog.
Becoming-animal is not imitation, it is making one's organism enter into composition with something else in such a way that the particles emitted from the aggregate thus composed will be animal as a function of the relation of movements and rest, or of molecular proximity, into which they enter.