Can an 8wo silkie exhibit rooster behavior, or just a fluke? (pic)

[mysweetgypsy]

I just picked up a few 8wo silkies and after about 24 hours introduced them to my 5wo pullets. Everyone seems to get on great, those silkies are awesome! But my blue one started acting like a roo? I threw in a heel of whole grain bread, as a treat. He took off with it, dropped it and started calling, he repeated this several times, then tried to mount a hen:/ Could this just be a learned behavior from his breeders house, or a definite sign? Here's his picture.

 

[CMV]

You might have better luck if you post this pic in the What Breed Or Gender is This? section of the forum. I have no experience with silkies, so I'm no help at all.

Good luck.