I love my guineas. They are not too intelligent, but brains is not the strong point of poultry anyway. They always look up, never down, hence they can be kept in a fence that has holes down at the bottom. They are the best at eating bugs, chasing snakes, and warning of dangerous critters. Last month a red fox showed up in broad daylight to drag one of my hens away. The guineas alerted me to the situation with that noise they make when things go to s--t (turn bad).
I started out with 12 but eight got killed through their own bad decisions (fly out of the pen and get et by a coon, or stick their head out through the fence wire and get their head pulled off by a possum),
But believe me, their eggs are great and they are worth their weight in gold as an exterminator.