How do you find out the gender of a caterpillar?

There are several ways to determine butterfly gender:

(1) the way they look.

(2) the way they act.

(3) if they lay eggs.

(4) autopsy. Males are usually:

A) smaller because they have less weight (eggs) to carry, they need a greater strength to weight ratio (less wing area to muscle size) for better agility.

B) have scent scales to announced their gender to a female. (also seen on the forewing of the male buckwheat copper at the beginning and end of the video, he's dusting the female's antennae with his scent) Natural selection favors healthier, less worn males with more scent scales.

C) more brightly colored for.

a: A poison warning.

b: A flashy decoy so predators will chase the agile one, while the heavier and less obtrusive female hides.

c: A territorial advertisement to other butterflies. D) have more pointed forewings for flight aerodynamics, built for speed, chase & evasion.

E) have skinnier abdomens: no eggs. THERE ARE MORE WAYS THAN JUST THIS, VISIT THE "RELATED" LINK