Hmm - I think I've been woodpeckered!

Sue & Mutton

Hi, our maple looks like it's been shot at! I'm assuming the woodpecker has been around. What do I do now? It looks hollow and not the best of specimens but is full of bud ready for spring, if it makes it that far. Should I just put netting or similar around it to stop it being got at. There's a nice fat juicy slug inside the top hole that I can't get at but Woody could- which is why I suppose he's been doing what he's been doing in the first place. Many thanks :-)