Mystery Chicken! Need ID help

Hi there! This is my neighbor's bonus chick from Murray-McMurray

The only other thing I can tell you is that she is about four months old and is a pullet. She's a standard breed, a pretty big girl, actually. She is bulky as well.

Any ideas?

Looks like a dark Brahma cockerel to me.

Well, maybe it is a cockrel, but all of the other males in the bunch ( the meat birds) have started crowing a while ago and s/he hasn't, so we thought maybe s/he was a pullet....

Three of my five (sigh) roosters aren't crowing, but they're definitely boys. The pic above just looked a lot like my light Brahma cockerels, 'cept w/ different color scheme. Maybe it's a pullet. I'm no expert!

You could be right, I have no idea :)

S/he looked like a chipmunk as a chick, except a mahogany and dark walnut color very dark. Is that what they looked like?