I agree with @Maro2Bear - it looks like a wild grape. I came across this interesting site which you might enjoy Know What Your Ancestors Knew - Foraging Texas It describes the "Mustang" grape in detail. Not saying that's what you have there, but take a look and see if there are similarities.Does anyone know what this is? And can sulcatas eat it safely?
thicker upright vineIt kind of looks like Wild Grape vine, BUT is this plant growing along the ground like a spreading ivy, or a thicker upright vine?