A person only needs one testicle for the military. You do not have to have two testicles in order to join the military at all.
For fertility, the ability to become a father, one is enough.
Generally men have two.
You cannot "grow" testicles. But if you are male you should have testicles and they will develop as you grow.
The average young male donkey will drop his testicles shortly after birth. The testicles will drop down with them 24 hours of birth.
The Male Gametes are formed in the testicles.
testicles
Penis or testicles
They are testicles on male cats.
Haemaphrodite
A human male without testicles.
Male Rabbit?? Testicles.
Normally the testicles drop at about 6 months of age.
A male's testicles are found underneath the tail, right under the anus. In an intact and mature male, the testicles are very pronounced. If the cat is neutered, then the testicles will not be apparent, but will be a gap between the anus and penis where the testicles once were.
If male ferret goes into heat, his testicles will appear. If he is fixed you will never see testicles