Quite simply erect some kinda bird bath.
Whilst flicking through a gardening book I found this interesting tip from Bob Flowerdew, a regular on Radio 4′s Gardeners Question Time and described as Britain’s leading organic gardener. He says that birds aren’t eating your fruit for the food, as they are low in calories. The poor little things are gobbling your fruit for the moisture – they’re thirsty. Therefore put up bird baths, they’ll drink from these and your fruit hopefully won’t get touched, or at least not everything totally stripped.
Sounds crazy I know, actively encouraging birds onto your plot, but maybe worth a shot… Also who am I to argue with Bob Flowerdew!