I came across a video that purported to be the ultimate answer to dissuade birds from pecking your strawberries. He painted pebbles (of suitable shape) red with white spots.
But do bird see colour as we do? Choose your paints!

His argument went somewhat like "the birds learn that strawberry looking things are hard and they don't come back". He swears it works,
but my take is you have to do it early and yearly because birds don't live that long.

As for slugs, use slug pellets but throw them in next door's garden, otherwise the slugs will congregate in your garden. (Gardeners Question Time - their tongues firmly in cheek)