Immature bird possibly second or third winter?
No interactions present.
British sea birds are much more difficult, for me, to identify than ours in Cape Town.
A lichen ménage à trois - http://science.sciencemag.org/content/353/6297/337
Some say it's time to throw the textbook understanding of lichens out the window.
"Now there will be more chaos, more confusion in lichenology ,...."
Lat/Lng: 51.50293, -0.02742
OS grid ref: TQ370800
Near the loch outlet to the river.