T.M.I overload

Hi there!
Sourland (Sir Sour) is a wonderful member here who likely chimed in on a previous post of yours.

Is the photo you posted current - meaning showing the bird at the current age of 4 months? Speckles appears to be a lovely pullet. Mounting is not always a sexual act nor is it unique to male birds.

 

Cockerel.

 

Sourland would be pleased if a breed of chicken was named after him. He is something special

 

He is indeed, very "special"

 

Your chicken is a bit of an enigma!
At 4 months I would have expected saddle feathers if it was a cockerel but I can't see any, which would suggest it's a pullet, but the head and neck just give me a cockerel vibe and the behaviour says cockerel, particularly if it is bottom of the pecking order. Older hens will occasionally mount other hens to show dominance but rarely young pullets, particularly low ranking ones.
How long has it's comb been red like that? Do you have any pictures of it when it was younger? If the comb was red a month ago, then I'm going to say it's male.

As regards breed, I'm pretty sure it's a mixed breed. I'm thinking maybe a speckled sussex cross.

One thing is for sure, if it's female, with a comb as red as that, she should be laying very soon. Pullets do some odd things at point of lay, so maybe that explains it's behaviour.

 

I'm thinking cockerel, and probably younger than estimated.

do you have any pics of when you first got this bird?