All information is referenced as fully as possible.
For a more detailed analysis, please refer to the animal well-being topic page. To choose a different subject area click on one of the links to the left. Because of the crowding, they often become aggressive and sometimes eat each other. This has lead to the painful practice of debeaking the birds. Hogs become aggressive in tight spaces and often bite each other's tails, which has caused many farmers to cut the tails off.