It's my understanding they are related to pigs - but are not of the same family - if that makes sense.
Mainly they aren't dangerous, unless they feel threatened (which is true of most animals, including us humans). And mostly they live on roots, grasses, seeds (explaining why they liked my bird seed!) but will eat small animals - a reason to not let dogs run loose near them, especially if they're hungry. That said, Peaches ignored them on our hikes; they ignored Peaches and me. I can't say I ignored them, as I was taking pictures.
Kelly - have left TX today and am now boondocking near Carlsbad, NM. Love where I am, but hate that I scratched the heck out of the side of the rv driving in here

I even walked it first - new there was one area might be pushing it widthwise, but were a couple. Went to take care of it (without gloves) and cut my hand up on the thorns, so will have to go back with gloves tomorrow - or sometimes before I leave. Will post exactly where I am after I leave.
Peaches is happy - she went in the water and brought tons of dirt and sand into the rv I had just vaccumed.