I used to live in the midlands, and regularly had a song thrush that would find snails in Mum's garden, and bash them repeatedly against the rockery to get to the snail inside.
I haven't even SEEN a song thrush in my garden, we get plenty of sparrows, have a nesting pair of blackbirds, collared doves, the odd starling and magpie (the last two I evict whenever I see them). I did see a woodpecker a few weeks ago, and what I think may have been a sparrowhawk (came and went in a flash).
As for slugs, I think the two resident frogs eat all mine (thank goodness), as I've not seen that many in the back garden this year, and from everyone else's posts, I understand they're everywhere this year. Snails I stomp on with my big wellies and leave for the birds to clear up.