If you hatch your own birds or buy a straight run from a hatchery (a mix of males and females.) (Anyone else think it should mean a 'straight run' of either males or females? Anyway.) if you do either each chick has a 50-50 shot of being a boy. If your luck is like mine it'll seems more like 70% when you buy a straight run, my theory being that more people buy all girls than all boys and the hatchery ends up with the exes of boys for the straight one shipments. Which is why I try to buy pullets (girls) when I buy chicks. There is still a chance of getting a boy when you buy all pullets, but I'd like to think it's lower than 50%.
Unfortunately, we've been having a better than 50-50 shot at getting roosters when we hatch. Three of Amy's chicks are most likely roosters, including that tricky Bared Rock. I won't stop hoping for hens until the caged birds crow, but I fear it's only a matter of time.
The trouble with roosters is manifold. They don't lay eggs, they get into fights, bad tempered ones will attack you, and the worst one of all: they may kill your hens.
We had a horrible time with Rhode Island Red roosters. When I was younger (9 or11) We put some young chickens in with the flock. Two were half Rhode Island Red roosters They "jumped" the hens, fond the weakest one and took turns jumping her until Mom grab one by the neck. The hen later died from her injuries. The rooster died immediately from his.
Last year, we had two roosters that couldn't have been more than a quarter Rhode Island Red. We didn't know they had any Red in them until they got older and started looking exactly like one. When they were about two months old Mom and I went to feed the chickens and saw one of them on top of a buff hen. We put him in a separate cage and mistakenly thought the second one was a hen because it looked like the offending rooster had been jumping him as well. (his tail feathers had been ripped off.) While we were setting up separate cages I heard a commotion and saw that the second rooster was jumping the injured hen. The hen didn't survive. We later ate the roosters.
So watch suspected roosters carefully. Rooster's often grow combs faster than the others and get taller faster. If you hear crowing remove them from your flock immediately unless it's only one, its the one you plan on having as your rooster, and you have the hens in a large enough pen. It seems worst with ones that mature early. (two month is early.) I've had roosters that were of different breeds and matured later and they were fine. But that might have been their temperament.
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Unsurprisingly the 'Surprise chicks' out grew their cage. Thanks to a little creative chicken shuffling we were able to put them in the brooder cage. We separated them; putting the ones we think are girls (very little comb growth) to the left and the probable roosters to the right. The photos are in that order too. We have five in the right side and six in the left, and are hoping that some (most) of them were mistakenly placed in the rooster side, while all the ones in the hen side are in the right one. (We can dream can't we?)
I put an old rabbit waterer in the hen cage I wasn't sure chicks could learn to use one. Leopard, who has lost her spots, was nice enough to demonstrate that they can while I was taking pictures. 
