That is a calculator to estimate the proper size for 3 male rats. And here is the MC site...
Sorry I am not much help there at the moment.
Good things to add to the cage are hammocks, tunnels, ropes and cardboard boxes. I also like getting cat & bird toys for them.
You can use fleece or I heard some people use tile to line the cage floors. I don't bother lining the cage floors,because my rats just tear anything off anyway.
I have taken rats outside...you can get harnesses for them or you can bring their cage outside. Or even a smaller travel cage if you wish. Do not keep them in too cold weather or too hot weather and never in direct sunlight. Also watch for predators and don't put them on grass you don't know,as there could be pesticides or other toxic stuff in it.
The 15th-21st of what month? February? Then yes,she should give birth any day now. Rat gestation is usually around 21-22 days,give or take a few. When she does give birth,make sure you offer her extra food and extra sources of protein,as she will crave it and if she does not get the proper nutrients,she can possibly eat the babies to get the nutrients she craves. But don't worry too much, rats are generally very good mommies.
As for breeding,don't do it until you do some research. I don't recommend anyone just pick up a male and female and throw them together...you have to have an understanding of genes and also you do not wanna breed pet store rats as their genetics are generally unknown.
* Lisa *
* To the world you are ONE person,but to a rat you are the world *
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* It's a rat thing...you wouldn't understand! *