At 3:20 sat back to observe -young now hungry whereas they were not at 2:00 - Parents appeared by 2:10 - no food - sat about together as when building nest. Made one attempt to come to nest - at usual place - or Compton away over field. young not afraid. - post heads up for food. Compton says while I was at nest birds would fly away by tens seen out over the fields and hover at 10-15ft watching me. Birds would not come to nest - then friendly female approached but fear stretched and walked about tree limbs where we had disturbed them 1/2 from nest to photograph. Also changed position of little posts beneath may have disturbed her. However such disturbances before have not affected parents so. - She sat beside nest and gave more scratches - did not feed but uprooted large fecal sac 1 cm in length or more and command to cast further stone dropping - when my going to nest young failed to raise heads as had done just before - eventually scratch signals young to see the presence at nest.