 After about 10 generations of controlled breeding, these foxes no longer showed any fear of humans and often wagged their tails and licked their human caretakers to show affection.These behavioural changes were accompanied by physical alterations, which included piebald coats, floppy ears in kits and curled tails, similar to traits that distinguish domestic dogs from grey wolves.Red foxes have been exceedingly successful in colonising built-up environments, especially lower-density suburbs, although many have also been sighted in dense urban areas far from the countryside.