You don't. (Well, you could find out if you REALLY wanted to, but it's difficult and prohibitively expensive, unless for some reason you really cannot wait a couple of months to find out ... you draw off some aminiotic fluid and examine it under a microscope to see the chromosomes in the cells; ZZ means it's a male, ZW means its a female.)
It's difficult even for people whose specific job it is to tell the sex of young chicks, let alone eggs. Most people who are not professional chicken sexers need to wait until they're several weeks old, and even professional sexers usually have a success ratio of about 90-95% at best. "Girl" and "boy" chicks just aren't that different in most breeds, though in some cross-breeds the males and females have different colorations.
Unless you are skilled at vent sexing, like they do to chickens, many lizards are very difficult to tell the difference between a boy and a girl. When my iguana laid eggs, I knew she was a girl.
you just look under its stomach
You can tell a boy horse from a girl horse by checking it's genitals. Males have a penis, Females have a vagina.
Minecraft is supposed to be genderless. A horse can be either a boy or a girl if you want it to.
A girl horse, a boy horse is called a stallion
A foal is a baby horse, colt is a boy, a filly is a girl .
A gelding is a castrated male horse. So it is a boy.
how do i tell if my my turtle is a girl or a boy?...
no it is not
you cannot tell if the caterpillar is boy or girl
its a gelding
can you tell if a fish is a boy or girl by the tail
its harder for a boy to tell if a girl likes him
YOu can not tell the difference between a girl or boy starfish.