I used to take pigs to the fair. We lived in town, but our grandparents graciously let us keep them on their farm and helped with their care. Every once in a while when friends would find out I took pigs to the fair, they would ask if we kept them in our backyard.
Pigs wallow in the mud because they don't have sweat glands, and it is how they keep cool.
They are very intelligent animals.
Hogs do not overeat. They eat until they are full.
Female swine are called sows. Sows give birth to litters of pigs twice a year. Each litter usually has eight to 12 baby pigs. Giving birth to baby pigs is called farrowing
(Last two facts courtesy of: Oklahoma Ag in the Classroom. The first two I already knew. :))