I was given two rats yesterday by my friend, who bought them from a woman so they wouldn't be used as feed rats. I went to petco to buy everything (I hope) they needed. They're both males, we were told they're brothers. I just want to make sure they're content and don't need anything else. They generally stay on the middle level of their cage, and haven't been in their shack. They've only been here about 12 hours but I'm worried there's a reason why they don't normally go to the floor and constantly stay cuddled up with each other. Do they feel unsafe? One of them seems to keep the other from drinking with him. Do I need to buy a second bottle? I'm planning on taking them to the vet today for a full checkup. I have a cat who has always been an indoor, and is afraid of every animal she's ever met (including a tiny little holland lop rabbit we once lived with). She checked them out for about two hours trying to figure out what they were and hasn't been near the cage since. I have no experience taking care of rodents, so I just want to make sure I'm doing everything I can, thanks.