First time chicken owner here. I ended up walking out of the feed store with 2 chicks after I went in for birdseed. They will be pets (I'm vegan). I was wondering about their sex. They were labeled black sex links and they have all black heads but a white spot under each of their chins. I read some places that any white at all means male. I was told they are approx 2 was old. Any ideas of the sex? All input is appreciated. Thanks!