Organismos unicelulares
De acordo com KA Applegate, os animorfos podem transformar organismos unicelulares. Como outros apontaram, o incidente no livro 18 deveu-se a uma sequência específica de eventos, e não apenas devido ao tamanho da metamorfose.
O único limite para o tamanho é que é necessário ter uma maneira de adquirir seu DNA.
Can the Animorphs morph germs?
KAA: In theory, yes. But there's no way to acquire one.
Scholastic.com - "According to K.A." October 1998
Can the animorphs morph single cell creatures? If so, why didn't they when they morph anything. Because germs are all over us.
KAA: You know, I've thought of this from time to time. The problem I have is how to "acquire" a germ. How do you know you're touching a particular germ? How do you focus on acquiring something you can't even see? If you figure it out, let me know.
Scholastic.com - "According to K.A." October 1998
I really enjoy your books, they are perfect for my busy schedule. (...) I remember you wondering how the Animorphs could morph bacteria. Well, if they ever wanted to, they could always press their fingers in agar in a petri dish. Within a couple days, colonies would form that they could touch.
KAA: You say you have a busy schedule and yet you found the time to consider the Truly Important Issue of morphing bacteria. Hmmm.
Scholastic.com - "According to K.A." January 1999