aka Devil’s Pincushion. These look like someone took a barrel cactus and buried it until only about the top 2” remain visible. This one is as big around as an average human’s palm. The thorns are about 1/8” - 1/4” thick. You can likely imagine why they get their name. They really can pierce horse hoof. This one is on the younger side, they can get up to about 12-14” in diameter given enough time.
I was watching tremors 1 tonight with my partner and there's a moment where Kevin bacon quickly scrapes gunk off a horse's hoof and it made me think, jesus, I don't know if it's worse leaving the gunk on or experiencing the cleaning. Poor horses