Pigs
Of the many animals exposed to the horrors of factory farming, pigs have perhaps suffered the most.
Despite having personalities and intellects similar to dogs, sows are kept almost continually pregnant, and confined to stalls where they are unable to turn around or express their natural behaviours.
The chronic stress means they spend much of their time engaged in purposeless behaviour, such as head waving or bar biting.
Prior to giving birth, sows are moved to farrowing crates; barren, concrete enclosures where mother pigs spend weeks at a time on their bellies as they wean their young. They have no chance to form any lasting bond with their offspring.