In the wild, it's a burrow. I'd imagine the term "cage" is just fine for domesticated rats though.
A baby rat is called a 'pup'.
nest
NEST.
vitamin k
Gerbils are more friendly than rats.And a Rat is a lot bigger than the little guy we call the Gerbil.
it is called a flying rat
A baby rat is called a 'pup'.
A pup is what a baby rat is called.
a rat
seagulls!
in the home
A Nest
nest
NEST.
hole
You could call them puppies or pups or kitten.
It may be stressed. Call the store/people you obtained the rat from for advice or call your local vet.