Despite their fowl reputations, roosters can actually be a wonderful addition to a backyard flock, keeping a watchful eye over the other chooks as they free-range peacefully. However, in some situations, roosters can be a problem. Maybe you’ve hatched a clutch of 12 eggs and ended up with 10 plucky little roos, or maybe you live in suburbia, where local council laws or cantankerous neighbours make keeping a backyard rooster difficult (but not impossible). Whatever the case, if you want them gone, you’ll need to take action - your roosters won’t be moving out on their own anytime soon! There are only two real options for the backyard keeper, but the decision is up to you.
Like cats and dogs, roosters can be put up for adoption. You can go through a humanitarian organisation like the RSPCA if you wish, but note that adoption rates for chickens, and roosters especially, are actually fairly low. Alternatively, you can find a home for him yourself. Advertise on Facebook, Gumtree or other local listings for the best results. If you’re looking to give your boy to a good home where he is wanted, make that clear in your ad, and be prepared to scrutinise and ask questions of any interested persons: some people may be looking to take him in solely for the purpose of grandma’s chicken soup. There’s nothing wrong with that, but you should decide for yourself whether you’re okay with him ending up in a stockpot (even if it isn’t your own).
To be blunt, the only other option is to kill (and, if you like, eat) them yourself. The objections to this are usually ethical and/or personal, but ultimately, something needs to happen to these unwanted animals. If you cannot find a friendly home for them, then it is your responsibility to find a humane solution - the most common means is swift decapitation, or wringing the neck.