The male Monarch has a black spot on each wing the female does not.
The male butterfly has a stick or penis that mates with a female butterfly. The female has a opening but no penis.
You can tell by the spots.
it is not possible to tell until the caterpillar has formed into a butterfly
You can tell the difference between a male and female Monarch butterfly by examining their wings. The male Monarch butterfly has two black spots on its wings while the female does not. The male also has thinner vein lines through its wings than the female.
easy....if its a boy it starts humping
Boy butterflies like leaves, girl butterflies like petals
dna if coloring the same for the species
I don't think you can until it changes into a butterfly or moth.
Blue Butterfly
The only way to tell is to look at the admen. For girls it is slightly larger than boys since they hold the eggs.
how do i tell if my my turtle is a girl or a boy?...
it is a boy but this is a girl
you cannot tell if the caterpillar is boy or girl
can you tell if a fish is a boy or girl by the tail