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3. Development of perching in hens;Appleby;Biol. Behav.,1989
4. Individual perching behaviour of laying hens and its effects in cages;Appleby;Br. Poult. Sci.,1992
5. Nesting, dust bathing and perching by laying hens in cages: Effects of design on behaviour and welfare;Appleby;Br. Poult. Sci.,1993