Have watched quite a lot of footage back today. Early on in the day, I thought I saw six chicks still alive, although there is quite a variation in size, with the largest chicks having their eyes open and feathers appearing. As the day progressed, though, I saw only 4 chicks consistently. I have rung around the six I think I could see earlier in the day….
Later footage clearly showed the wing feathers deleoping on the biggest chicks….
I am concerned that the depth of this nest means that some chicks are getting ‘lost’ underneath. The female virtually disappeared today on numerous occasions as she seemed to be trying to do something underneath… retrieve the other smaller chicks? You can just see her tail feathers in this screenshot.
I certainly admire the work involved raising chicks…. those blue tits are going to be exhausted!