@kjarn Yes, seemingly (according to my google search) the jackdaw's eye is quite special and is used to communicate with other jackdaws, and also as a warning signal to deter competitors! Most of the jackdaw's corvid relatives have dark eyes.
@randystreat Thanks Kathy. The round birdbath we bought from our garden centre, but the tall one, on the right of the image we took from my dad's garden before his house was sold. It is my favourite as it has been in dad's family for over 100 years.