Chimney-Sweep Birds

I spotted this pair of jackdaws on the northerly boiler house chimney from quite a distance away this morning. They are known as chimney-sweep birds as they often nest in chimneys. Their natural behaviour is to make their nests in existing crevices which they drop twigs into. When they drop twigs down chimneys it can cause blockages.

Their light coloured eyes are a warning signal to predators. Black birds on Black Friday. :)