@ DoubleDog -- we have heritage crosses; none of them are pure-bred (better genes that way we think). The boar is a Large Black-Hampshire, two of the sows are Duroc crosses, the other sow is a Tamworth cross (and she loves the forage more than the others...she prefers greens over dried grains any day!). The piglets are a mix of all of those They would prefer the woods in the hot, sunny season, but we haven't fenced in that part yet so they have to make do with scattered trees and scrub.
The pigs bring an enormous number of volunteers to the pasture...squash from the excess zucchini that I gave them last fall, LOTS of corn and oats from their feed, and even some tomatoes from the end-of-the-season green tomatoes that I couldn't keep up with canning. They are amazing at clearing and aerating the land. Sod gets chomped and then flipped over so they can get at the roots. I'd recommend them to anyone who has the space.
I do like the tall grass; and it does indeed bring snakes, which I also like (but of course ours are non-poisonous!). The birds seem to like the tall grass too -- red wing black birds perch on the goldenrod. Last year I had such a terrible slug problem until the birds found my garden...
I feel like in other years I could stand being a bit more lax on "weeds" in the garden...this year has just been so dry that I feel like I need to spirit away all the unplanned greens to save every drop of water for the planned things!