When my son was still at home and a teenager, he raised chickens, some ducks, some pheasants and one turkey. Yeah, he kind of liked birds back then
We never had any guinea though.
Now the same kid (who's going to be 32 this fall) has his own calf business. Right now he has forty-eight calves; with his next delivery due in two more weeks. He raises them for local farmers and cattle farmers.