There are all sorts of discussions about what type of animal Pikachu is...some think he's a mouse. Looking at him more closely, it's hard to tell he is as his shape and colors don't quite match anything else I've seen.
I am still struggling with the whole concept of Pokemon, as the fighting creatures with magical powers live in a small round ball which is actually a whole different world with food and shelter. I am unclear as to how they get in and out of this ball world whenever they are summoned, but it looks quite cool when it happens.
But according to the official documents, he is a forest dwelling creature that stores electricity in the pouches of his cheeks which he must occasionally charge.
Back to the discussion...
The official book says that Pikachu is in fact a "mouse pokemon", however , other people, such as myself, think Pikachu is actually a different animal. My best guess that he is a cat.
Look at this picture and tell us what you think: