on that never aquiring ANY earth animals. If he had some they would have been caught alot quicker.
I don't think I quite agree with you there. Visser Three used the morphing technology primarily for dramatic effect. Eating Elfangor, trying to kill the Animorphs, even going so far as to use morphs acquired from the Andalite homeworld in an effort to demoralize the "Andalite Bandits".
Morphing for the most part was intended for stealth and infiltration. In the Animorphs cases, it gave them the advantages that frail, limited human beings don't have. Without it, we kinda see what would happen to them in Megamorphs 4.
Visser Three is a Yeerk in a body that can run, jump, and fight. He can see in all directions. He commands a technologically advanced army that contains some of the deadiest creatures the Galaxy can cough up, so that he has no need to actually use any of his gifts, except for the aforementioned dramatic effect. It's an added perk to an all ready impressive list of upsides.
He doesn't need the morphing power for the same reasons the Anis do, so morphing Earth animals really would have served no purpose in actually routing them out. Not that he didn't find certain specimens attractive. The tiger for example, Visser Three praised it quite vehemently. But if he had ever gotten around to acquiring it, once again it would be purely for the dramatic effect.
The only time he's ever strategically morphed was to evade an assassination attempt. And at that point I assume he morphed anteater since it's the only Earth morph we ever see him acquire on screen and it would be small enough to hide between a compliment of Hork-Bajir guards.