This area used to be full of them. I've had a few myself. Got to watch for bottle tits, and though not wild, they are more stand offish in my experience.
I owned a little shorthorn cow, bought from a neighbor, who weighed 875 when I sold her. Her calves were always around 50# lighter than the biggest in the group, but I swear she lived on air. Everyone would be at the hay ring except her, she'd be way off by herself picking whatever she could find (see the stand offish comment above). When I sold her the man at the stockyards said she was probably 20 years old, which I'm sure was a stretch, but she was way up there. A group of thirty like her would replace a group of 20 regular size cows with no more inputs.