I've had my two budgies for one month. They are young -- about 4 months and 6 months. I put their cage in a room where it is safe for them to fly free. I leave the cage door open all day and they enjoy flying in and out, and being on top of the cage, but otherwise are not exploring. They also don't really explore inside the cage much. Is this normal? Will they eventually explore? I put a bird bath on top of the cage, but they walk up to it, then walk away. They are happy little boys, and very affectionate with one another.