Why are not all Exceeds able to transform into an anthropoid (humanlike) form? There are several exceeds known, and as far as I can remember, only Pantherlily and Samuel are shown to turn into human form.



So, why can't other exceeds like Happy and Carla change into human form as well?
I am not sure that this applies for Pantherlily and Samuel, but in chapter 421, Charle could transform into anthropoid (human-like form) because she learned transformation magic.



This may be the cause that Pantherlily and Samuel could transform, and Pantherlily saying that he could maintain that form for certain time only when he's worn out in battle because it requires magic to maintain it.