Coyotes Chasing and Eating Pigs

This is crazy, i put a small pig in a pen today by itself. Just a couple hours ago a bunchof coyotes exploded so loud it startled me. My dog's went nuts, I went outside to see what was going on and when I opened the door it was so loud it woke my wife up. I can't say they were after that little pig but that's the general area it was in and that's only about 30 yards from my house. We have a boat load of coyotes around here and I've heard them all my life, but never like that. I cut the light on and everything went silent. Walked down to the pen but I didn'tsee anything. Been thinking hard about some steel traps.