A bettle can vary its egg laying to thwart parasitic wasps. The upper eggs in the stack are not really viable, and fool the wasp! But the bettle also seems to know if there are wasps or not, and varies its egg laying accordingly. Only epigenetic mechanisms could do this, not Darwin's hunt and peck of chance mutation and natural selection:-http://www.physorg.com/news/2011-09-beetle-eggs-shields-wasps.html