Broken corral fence board

This morning I found one of the boards was broken in the corral fence.  No idea how it was broken.  It appears it was broken from inside the corral.  The heifers aren't big enough to break it.  Perhaps cow #20 pushed a heifer out of the way and into the board.  No heifers got out of the coral or cows got into the corral before I replaced the board.

I went to get my camera and cow #7's fat heifer calf came over and checked out my tools.

After I finished the work Mama's heifer calf immediately came over to check out my work.