I did give them 3-4 that I found and worried briefly about how hard those shells are...then saw one of my pigs breaking rocks in her teeth just because!
dang pigs! just another reason to hates them pigs... we had a black walnut tree over at the old farm and i couldnt get those stupid nuts to crack with a jackhammer!
hum.. maybe i'll take a bucket with me next time we go over there...