Bumbarrels in the brambles

The grebes have been on eggs for a couple of weeks now, so action is slow and largely restricted to changeovers every hour or two.  Still worth some time, but my mind drifted to the long tailed tit nest in the briar patch behind me.  As the grebe activity has been at long range I had resorted to 1200mm of lens and my 1DIII with it's 1.3 crop factor to try and get something worthwhile. 
I could hear the tits churring as they worked through tree branches above and wondered if I could turn the lens at this high magnification to see the nest without going near and running the risk of disturbing them - or attracting attention to them, as many nests get predated.  Sure enough by moving a few feet to one side there was a window through the brambles.
The birds were going in and out periodically.  Not award winning images, but fascinating to watch.  The nest hole is snug and the birds squeezed through, almost popping out as the nest walls flexed, the mix of webs, lichen moss and feathers springing back into shape behind them.

 Fingers crossed they make it.