13th December 1999. Here is a reminder of the appearance of the camera, viewed inside the box from below. It takes over an hour for Fluff to settle and finally he puts his head under his wing and goes to sleep. He spends time preening, and listening to the noises of the night outside, as in this picture, where there is a rattling and tapping noise on the box, possibly caused by an antenna wire blowing against it in the wind. The outside temperature is about 6 C. 14th December 1999.
Fluff starts to shiver and shake and look around to see if it is time to get up.
It is cold outside, 5C, and there is a light wind blowing. The bird has been asleep since about 16.50 GMT on the 13th, or a total of 13 hours, so must have lost a lot of heat energy in that time. We see why he is fluffed. No light being visible, he goes back to sleep. The bird body temperature is about 41C so there is a temperature difference of about 36C between his core and the outside world.