I have two 2.5 month old guineas sex unknown still bcz I can't tell their sounds apart. I have them with with same aged bantams chicken and turkey and the only issue I have is my for sure Tom turkey pecking at my baby goose. Everyone gets along great. They are enclosed with a 25x25 house and a 35x20 run full of bugs and grass. I can't free range bcz of my dogs. Just always make sure they have entertainment like treats to forage for.
Your guineas have not reached the problem stage yet. It is quite common for guineas to be raised with chickens and people post about how well they get along and then comes the first breeding season. When the guineas get their hormones raging and their number is too few to take it out on each other they can become little terrors to all of the other poultry. Guineas are by nature feather pullers and they are quick little things. It doesn't take them very long to destroy a roosters tail and wing feathers or a turkey's also. The other poultry do not like their feathers being pulled and the guineas can become bullies.
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