I don't know about for Rattus Rattus (roof rat or black rat), but Rattus Norvegicus (the brown rat) can have up to twenty-two, but twelve is a more likely number. Same applies to pet rats, as they are also Rattus Norvegicus, just domesticated.
rats have 6-18 babies every 23 days if not seperated.
No, mice and rats are two different species. Rats have rat babies, mice have mouse babies.
rats normally have 7-12 babies
I don't know, maybe because of the wild rats. The wild rats are nasty, and spread diseases, but then people add that detail to the domesticated pet rats. I think pet rats are very clean, if you take care of them. Hope I helped ^^
No unless interaction from a male rat (such as getting a rat that is about to have babies). two female rats can not have babies
There are so many risks to health from rats. They can transmit a number of diseases like dysentery, plague, typhus and leptospirosis among others.
7-8 babies in captivity but in the wild they can have 7-9
7-8 babies in captivity but in the wild they can have 7-9
Rats defecate where it is convenient for them.
Wild black rats.
No. Wild rats can have diseases, but are not poisonous.
up to thirteen.