Around the world, more than five billion species of hoofed animals – known as “ungulates” and including species such as giraffes, horses, pigs, alpacas, or yaks – are kept as livestock or in zoos and safari parks. A new study led by Aberystwyth University and the University of Portsmouth has investigated which of these species are better suited to captive environments and which display significant levels of stress and require better husbandry if kept in captivity.  By examining the behavior of over 15,000 individual animals across 38...