Author Topic: Rat Size  (Read 560 times)

Offline RattyRodent

  • Sr. Member
  • ****
  • Posts: 292
Rat Size
« on: May 23, 2017, 10:19:32 PM »
Mrs. Ratty here,

     Would like to know if male rats are naturally twice as large as female rats.  After having eight female rats over nine years, Mr. Ratty and I took in three males, one neutered, two intact.  We were both a little startled at how large they are.  Their main diet is Oxbow, but they also had children's cereal snacks as treats.  Is size governed by glands or diet?

Offline RooRat

  • Posts Too Much!
  • *****
  • Posts: 2754
  • Rest in Peace Petyr, Renly, and Myka <3
Re: Rat Size
« Reply #1 on: May 23, 2017, 10:25:52 PM »
I think body size is governed by genes. My Pyp is huge - 2 pounds at his prime - and his whole family was big, even his sisters. I met his daddy and he was a giant!
Mom to Pyp!
Visit my Etsy shop!

Offline BigBen

  • Posts Too Much!
  • *****
  • Posts: 7337
  • Rattos habeo, ergo sum
Re: Rat Size
« Reply #2 on: May 24, 2017, 08:07:03 PM »
I had one rat, my beautiful sweet Raphael, who was a two-hander, weighing nearly a kilo.  His brother and littermate, my beautiful sweet Uriel, was more normal-sized at somewhere in the range of 550 to 640 grams, as I recall.  There is sexual dimorphism in Rattus norvegicus, but the size ranges overlap, just as they do in Homo sapiens.  In general, bucks are noticeably larger than does, but I wouldn't say that they are normally twice the size, more like 125% to 150%.  But if the girls you are used to were on the small side, and your new boys are on the large side, the contrast could very well be more noticeable than usual.

You may be interested to know that among chinchillas (in Chinchilla lanigera, at least), the dimorphism works the other way:  the females being quite a bit larger than the males.


What is a rat?  King-sized love in a pint-sized package.
Rat Code:  6m2f22r !B C? D+ F S-- ocA reC sM a+++ e++++ n

Offline Nysander

  • Newbie
  • *
  • Posts: 35
Re: Rat Size
« Reply #3 on: June 11, 2017, 04:37:54 AM »
Boys are typically larger than girls but it can vary quite a bit.
On average, most of my boys have been a little over a pound at adulthood but I've had two who were over a pound and a half and I have one boy who is very light, acrobatic, and feminine in build who only weighs ~500 grams

Most of the girls we have had have weighed around 350-500grams (right at a pound or a bit less)