How big is the entrance hole in the Midwest Critter Nation Small Pet Habitat?

BLNR

New member
I'm looking at getting the Midwest Critter Nation Small Pet Habitat, but I'm not sure how big the holes are that allow the animal to get from one level to the other. Would they fit a chinchilla through?
http://www.petsmart.com/product/zoom/index.jsp?productId=3402796

I want the top picture (double unit), scroll down and you'll see the single unit with the chinchilla.
My friend's setting up a coroplast siding so I can make the bedding deeper :). Thought someone would ask that!
 
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