mistle thrush chasing away a magpie. I'm guessing that the thrush was concerned that the magpie might steal her eggs.
It's not just the bluebells that are spreading. When I started my voluntary work helping Water of Leith Conservation Trust to look after Colinton Dell, there weren't many celandines here, but now there are carpets of them and this year they seem to be lasting much longer than normal
Another much more destructive invasive plant is Japanese knotweed. There isn't a lot of that in the Dells and the largest patch of it recently disappeared. On the Trust's volunteers Invasive Plant walk on Monday evening, I pointed this out and congratulated the staff on having the problem under control. However, it seems that the patch wasn't treated by the trust but had been removed by contractors who had to remove a fallen tree. It seems that no-one knows what happened to the Knotweed plant when it was removed and there are fears that it was chipped down with the wood from the fallen tree, which means this little area of the Dells could face a larger Japanese Knotweed in the future. As you can see here, there are already new shoots growing from the rootstock (this is normal, you need to treat the plant for at least three years to properly get rid of it.)
goldcrest, which was busily looking for food, hopping from branch to branch in trees that were below where I was standing, so I had a wonderful view of the crest on its head. There were in fact several goldcrests in the Dells, singing their high pitched song. I also heard willow warblers singing, which was lovely. Willow warblers visit the Dells some summers, but not reliably every summer so it was nice to have them back. Yesterday evening I lead a birdwatching walk round Arthurs Seat and we had wonderful views of willow warblers, two of them posed for us so that I could describe how to recognise them from the superficially identical looking chiffchaff (willow warblers have paler legs and longer primary feathers in their wings). You generally need to wait for them to sing before you can tell the difference.