Now I finally have to accept that it is real. So what are we talking about? The Brook Lamprey Lampetra planeri.
They use the amazing suckers on their mouths to move small pebbles around to make their nest site.
There were only two fish making this nest, often there are more and they will cooperate to move larger stones.
Many thanks to Rich for finally proving that these fish do actually exist.
The other highlight of today was that there were the first three Wood Warblers back in the Forest. The obsession resumes.