Roland Perry wrote in message ...
In message , Ian
Johnston writes
Or points to it happening at one o'clock in the morning in the middle
of winter, and them needing a few hours of daylight to do a proper
search of the area?

Or that the "resource" they are missing is floodlighting?

A very, very, very, very poor substitute for sunlight. Remember that
they are looking for tiny things, and although floodlights may look
bright they are either very directional - so things get hidden in
shadows - or much dimmer.

Ian