Adding more Degu's?

I have 2 female Degu's that are about a year old, they are both
friendly and healthy. They have a large carge that is about
36" x 36" x 24". I would like to add either 1 or 2 more, but
I wondered if it was cause problems. The 2 I have are very
close, but I don't know how they would react to an outsider?
(or 2).

The other thing is that they love to chew the bars, I have given
them loads of other things to chew on (branches, cardboard,
those little white blocks etc.), but after a few minutes of chewing
on the new thing they always go back to the bars. Can anybody
think of something else I could use?

BTW I did find 2 Degu NG's, but they were just porn spam,
does anybody know if anybody does actually post Degu stuff
there?

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Dean / Psyonic
www.aspexdesign.co.uk Free graphics files and more