Neophobia is a tendency to dislike anything new; in relation to eating behaviour it is a tendency to reject new or unusual foods. Evolutionary psychologists suggest this is a naturally occurring reaction that helps protect animals (including humans) from the risk of being poisoned through eating something harmful. This would increase survival chances, especially for animals like humans that eat a varied diet. It has been found that neophobia is much less common in animals that eat a restricted number of foods (e.g. koalas), than it is for those that eat a broad and varied diet (e.g. rats).