If you acquired a couple of hundred morphs, you'd forget what you had though. Sure, you could catalog them all for thorough reference, but in the heat of battle it's much easier with their 20-30 or whatever. Besides, functionally, you only need two or three birds, two or three insects, fighting morphs, water morphs, etc. Practicality, yo peeps.
hehe... maybe you took soo many morphs that you forgot, so you thought, oh, centipede or rabbit or whatever, so you just have to hope that you have the morph. think about any animal, and if u start morphing, that means that u have that morph. if not, then u dont have it.