Last week we found one of our chickens had been attacked on his back, she managed to escape to the chicken coop but died. The next night we awoke to chicken noises at 2:30am. we got up with flashlights to see if something was attacking them, to our surprise they were all outside of the pen. All chickens had their wings clipped so they couldn't fly (we thought) and had never gotten out before (6 ft. chainlink fence). They were here and there all over the yard, at 2:41am we had an earthquake, centered about 4 miles from us, it was a 4.1 in Yucaipa, CA. We rounded them all up and put them away and it hasn't happened again. The only thing I can think of is they knew the earthquake was coming?? Wierd. Is that why they say "the chickens flew the coop" - seriously it was wierd and I'm still scratching my head.