http://orgprints.org/14778/ A note on fear reaction of three different genetic strains of laying hens to a simulated hawk attack in the hen run of a free-range system Hens well adapted to free-range systems should react quickly to avoid an attack by a predator but should also be able to return to the hen run soon after to ensure good use of the outside area. Zeltner, Esther Hirt, Helen 9poultry 5animalbreed animal-husbandry-and-breeding A note on fear reaction of three different genetic strains of laying hens to a simulated hawk attack in the hen run of a free-range system 2008-10-23 Zeltner, Esther and Hirt, Helen (2008) A note on fear reaction of three different genetic strains of laying hens to a simulated hawk attack in the hen run of a free-range system. Applied Animal Behaviour Science, Issues 1-3 (113), pp. 69-73. application/pdf