We have one in our sorority who we are starting to question whether or not she is actually a he.
It's behavior is a little more like the males we have, with always wanting to be up front, and interacts with us more so than any of the other females we have.
There is an egg spot, but I read recently that sometimes males may have something that appears like an egg spot.
This is the Alpha in the sorority at this point, and considerably larger than the other females, which we attributed to age. He/She seems to get along alright with the other females, and hasn't been a problem.
Sorry that some of the pictures are blurry.