The worst torture to which a battery hen is exposed is the inability to retire somewhere for the laying act. For the person who knows something about animals it is truly heart-rending to watch how a chicken tries again and again to crawl beneath her fellow-cage mates to search there in vain for cover.
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Source, in full
"Animals are Sentient Beings: Konrad Lorenz on Instinct and Modern Factory Farming", in Der Spiegel (17 November 1980); as quoted in "Scientists and Experts on Battery Cages and Laying Hen Welfare", Humanesociety.org (Archived 27 August 2010)