My rat,Domie is almost always by the door.All the other rats sleep in their hammocks or houses,but not Domie.He's always got his little nose sticking out through the bars.And,Domie is high up on the food chain of his group.I think he just loves coming out to play.Whenever I go up to the cage,he licks me like crazy,like he's sauing,"pleease let me out"!Or maybe he just loves me!

Maybe the little guy just loves his outside time?
But,Domie does play with the other rats too,I guess.