Official Loofah Tester
Join Date: Dec 2009
Location: SE United States
Hey Odyssey, welcome aboard.
I'm no expert, but he looks like he's roughly 5 -6 weeks old. He can be anywhere from 7 to 9 in inches long full grown and weigh 600-700 g. Intros with another male rat will be easy if you get another juvenile close in age. The rough cut off age for easy male intros is 4 months give or take from all I've read, but don't quote me on it. Rats wean at 4-5 weeks, so he's really young. Just get you another boy of similar size or a little bigger.
If it were me, I'd get a new rat and settle it into a temporary cage for a couple of days--perhaps a plastic storage bin. Then introduce them on neutral territory a couple of times, like in a bathtub. They should have no problems at all at that age. For good measure, clean out your cage well before introing both of them to the cage.
You didn't ask, but for a pair of full grown rat boys, you're going to need at least 18 inches deep so they can turn around. My cage for my two boys is 30 x 18 x 24, but there's lots of variations in size that will work. I've got lots of links on cage related stuff if you ever need it.
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Hanging out in the Land of New Feetsies:
Melon, Skinner, Black Pete, Zanna, Custard, Tucker, Jeffrey, Zmei, and Windham.
Last edited by Storyseeker; 01-01-2011 at 02:50 PM.