During a feed after 17.00 on Sunday when Chick 3 was visible much of the time it did not move at all. Nevertheless Mrs 37 brooded it after the other chicks had eaten.
That was the last time the tiny chick was seen. In 2012 the adults removed a dead chick quite quickly as mostly happens.
So sad, but it was very weak. By hatching it contributed to knowledge as for three eggs to hatch that had been trampled over several minutes demonstrates their resilience.