Really? I know there are cultural differences between here and there but I didn't realize there were species differences as well; ALL domestic cats I've ever seen bury their crap.
The term 'bury' is a loose one in this case though. They don't bury always in the literal sense...sometimes they sort of lay their logs in a depression or just dust them with soil... Can't say I've ever seen them do it on concrete though. Must be something else with similar sized chuds, like a Yorkshire terrier or something.