Most people who want to attract birds to their gardens put out bird-seed, or - if they’re really adventurous - mealworms. However, on the East London dockside where I lived until recently, one of the residents strewed the quayside with livers in December last year. Was this was a deliberate ploy to attract carrion crows for bird-on-variety-meat action? I don’t know, but whether or not this was the intention, it was certainly the result.