Something ate my grapes!

I live in SE GA Something ate my Scuppernong grapes two years in a row. Right when they were at their peak. Is there a way I can protect them from being eaten this year?

Occasionally, the yellow jackets get a craving for them ( over here in Alabama) when they are very ripe to a little past prime. My experience it's depends on the rain. If it's really dry it seems they are out seeking anything that's really juicy.

I have a young Mars Seedless grape that grows up one side of my front porch. Last summer, something ate my whole first grape crop, a pound or two. Whatever it was left just the skins. I thought maybe a squirrel, but my trees are all young so very rarely see a squirrel. I thought it looked like something sat right on my porch and ate them. I suppose yellow jackets would leave the skins? I don't thing many animals would. Maybe mice?

A few years ago at about midnight I saw my cat staring intently at my grape trellis.
The trellis is horizontal at about 6 feet high. There was an entire family of raccoons up there. I drove them off but before morning they pretty much stripped it bare.

Two pairs of Cardinals devoured the grapes outside my office window. It was interesting to watch as both pairs were rather territorial in regards to my grapevines. I'm hopeful they do it again in 2016.

We have lots of wasps pricking holes in the grapes. It makes it a challenge to pick them. I haven't gotten stung yet. Whatever is eating them is doing it at night. If I put netting on them would that stop the critters from eating them?