Finally, something I'm qualified to speak on. They may be found alone, but are indeed usually found in little groups. In my case, they usually surround the house (
Pima County). They split into little ravenous groups of seven and look for food. Since there aren't many
vegetable gardens around, they usually help each other to push your trash cans over and look through them. They are quite
mean animals, and its best to leave if you come across a pack in the dark. They'll stand at the gate and look at my dog and snort at it and the dog barks back. Pretty funny.
The worst part is the
smell. You can tell when peccaries are about, because you'll smell them before you hear them (The sound is awful too, piggy-
screeches and tusks rubbing against whatever tastes good.)