Whats the difference between a boy and girl monarch butterfly

Question

i know it has something to do with a dot on its back

Answer 1

The male Monarch Butterfly may be easily distinguished from the female by noting the two highly visable black spots on the insect's hind wings and the thinner black webbing within the wings. The female's webbing is thicker and she has no identifying wing spot as the male does.  

Answer 2

excellent question and excellent answer, Maureen.  i didn't know this.

Answer 3

yeah. there is a dot on the boy's back..lower right wing i think