It's kind of fun to see all the different kinds of barbed wire! I've been in agricultural museums where they've had samples of all the different types there were. Some quite unique!!
Perhaps you found some of the variations, FryGuy, as you did your web research?
Yes, it can do damage to horses/cows and people too! ... though sometimes that's the least of a farmer's concerns and more to keep them contained where they are supposed to be.