The distance from the anus to the genitals is far greater in the male than the female. Male rats start to show the developement of their testicles around the age of 2 weeks old, and really show by the time they are 4 weeks old. Wiki User February 19, 2011 11:23PM. This is the distance between the genital openings (penile opening in male hamsters; vaginal and urinary openings in females) and the anus. The most prominent trait of female Rats lies in their meticulousness. Back view of young Seal Point Siamese rats. A rat should be spayed or neutered at around three months of age. It's also possible at this age that the size of the scrotum starts to cover the anus in the male rat, whereas the anus is still visible in the female. There's no mistaking a male rat at this age. Because male rats tend to be laid back and sedentary, they often don’t burn as many calories as the females, making them more liable to suffer from obesity, which causes all sorts of health problems. First, put some vanilla extract on your hands and lightly rub the coats of both rats (keep them seperate). The distance from the anus to the genitals is far greater in the male than the female. You can see the vaginal opening just below the urethra. Adult male rats “letting it all hang out.” The side view of an adult male rat. Just a warning - If you have a male rat, DO NOT put another adult male rat with it. Answer. Most people can spot the difference between a male and female baby rat by the third week because that is when the scrotum becomes more visible on males. Female Rats are very … Adult male rats are extremely territorial, and they could seriously injure each other. The surest way to tell whether a hamster is male or female is by looking at the anogenital distance. The bottom view of an adult female rat. RattyRat.com was a great website with vast information for pet rat lovers.Unfortunately it has closed down, but our collaboration will remain and JoinRats will host some of that site's useful information. It is very hard to see the gender differences in baby rats, unless you can look at the whole litter. There's no mistaking a male rat at this age. The bottom view of an adult male rat. Separate Males And Females At 5 Weeks Rats become sexually mature as early as 5 weeks of age . This distance is much shorter in females than males. Male rats start to show the developement of their testicles around the age of 2 weeks old, and ***really*** show by the time they are 4 weeks old. How do you tell if a rat is a male or a female? Females can stay with their mother; males need a separate cage. Rats breed quickly and early. The best way to hold your rat when you are trying to figure out if they are a male or female is to have them comfortably on their belly, then lift their tail. Female rats come into heat every few days. The side view of an adult female rat. It's also possible at this age that the size of the scrotum starts to cover the anus in the male rat, whereas the anus is still visible in the female. Sometimes, a detail could tell a lot of things and change your impression on someone. Many rat owners decide to simply keep rats in groups of the same gender, rather than put their rats through surgery. Here are a few sharp photographs on the sex of baby rats. This is a good way to tell whether or not a snake is male or female when you have two snakes side by side, but trying to figure this out with only one snake can be rather difficult, so they have invented a few other ways to determine the sex of your snake. If your rat is female, you can't just dump another rat in there. A male baby rat at around 1 week of age is pictured on the left.