Para evitar os excessivos instintos do Howler, para evitar o vazamento de informações confidenciais, e por causa das preocupações morais envolvidas com as criaturas sencientes que se transformam.
Will Jake be able to morph a howlers, and if he can, will he use it to attack the Yeerks?
KAA: Hmmm. Good question. However, I suspect that if Jake were to morph a Howler again for an extended period of time, he would tap into the new and improved Howler collective consciousness and acquire their own kinder, gentler frame of mind.
Scholastic.com - "According to K.A." March 1999Why does Jake not use his howler morph? It is very powerful and could win the fight against the Yeerks.
KAA: There are two problems with Howlers as morphs. First, since they are all united psychically Jake could end up inadvertently communicating with other Howlers, possibly resulting in information getting into the wrong hands. Also, Howlers are sentient creatures and the Animorphs have a policy against using morphs that are essentially equals of humans.
Scholastic.com - "According to K.A." December 1999