Posted at 11.45am

With a low of 6°C last night, life for the chicks changed.

For the first time since they hatched, mum left the chicks alone and they all had to huddle together to keep warm:

Huddled together at 1.43am this morning.

Excitement
No one has yet made the jump for freedom today, but at times it has got very close and everyone seems a little excited about life:

Sit back and enjoy this video, it's 12 minutes long ... excitement in the nest gets a little noisy and preparations are being made here.

So Close
Several times this morning a chick has poked its head out, and very nearly looked like it was going:

The time for fledging is just getting so close.

Feeding
Feeding routines have also changed, and dad did well to find a caterpillar this morning, and if you're by the hole you've got a good chance of getting the meal:

The serving hatch.

There will be another update later and we'll see if anyone has decided that today is the day ...