Research examining the behaviour of a number of animal species found that some were less bored and more active when they had human visitors.
Animal behaviour experts at Nottingham Trent University and Harper Adams University looked at more than 100 research papers examining how visitors affected the behaviour of more than 250 species in zoos.
They were also less likely to use repetitive behaviours, which often indicate boredom, in the presence of many visitors. Dr Samantha Ward, a zoo animal welfare scientist at Nottingham Trent University's School of Animal, Rural and Environmental Sciences, said:"Some animal species have been born and raised in zoos and so have likely become used to the presence of humans.
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