I'm not sure. Sorry. I only have wild muscadines on my property here on the FL / GA line. Those are the only ones I can identify. I don't know where you live but if you can find your nearest agricultural extension office take the pictures and some clippings with the leaves and a few grapes in to them and those folks should be able to identify them for you. They're usually chock full of all kindsa helpfull information and in my experiences bored off their butts just sitting around waiting for folks to come in with questions. Good luck with your search and let us know what you find out.
-mike
you would be better off posting this in a viticulture forum or do what mike said. It looks like the yield is pretty low on this vine so go luck with making wine out of them, also animals will come and eat them and it kinda looks like this is already happening. if you have a bunch of them growing, prune them back and then net them and maybe you will have something to work with.
Those don't look like any grape leaves I ever saw; are you sure they're even grapes? I'd take a sample of the leaves & the fruit to your county extension agent for positive ID before I did anything else.
Regards, GF.
yep you are right, good call and good job not eating the fruit, its wierd that animals can eat it but not humans, very strange. sorry for trying to help, I only have 2 vines at my house so my experience in viticulture is limited.