A male rat has testicles and a female does not! Take a peek under the tail! They are rather noticeable!
If the male is neutered it may be more difficult. In that case compare the rat to another rat you are sure of the gender of. Male rats are a lot larger than females. Also you may be able to feel nipples on a female rat's stomach.
1. You may be able to find a small bump that is the male rat's penis.
2. You won't be able to find any nipples.
3. Male rats tend to be a lot larger than females.
No difference
you do it
The males are smaller than the female
the male has a white tuff and the female doesn't
Physical features and emotionalism
That depends entirely on the species.
Males have a penis and scrotum and female dont.
bass clef its obvious
i don't now
Check their genitals.
By the stamen inside the flower
Females quack