I've watched them do the same going over electrified fences put up to keep them out of ripe grain fields.

My lease has some old forest with 2 1/2-3 foot thick fallen timber, sailing over the top doesn't even slow them down much. The smaller ones find a way around or under.

One thing that amazed me with younger hogs was when panicked they'd run right through a barbed wire fence. The sound kind of reminded me of Banjo music.