The unique bird - which is almost entirely snow-white, save for its beady black eyes - was spotted flitting between two trees, seemingly gathering materials to make a nest.
The part-albino robin, which is even sporting an almost-white beak, "stuck out like a sore thumb" as it perched on a branch above a cycle path in Middlesbrough, North Yorkshire, said wildlife photographer Brian Matthews.
But the bird seemed unfazed by passers-by - and was even flanked by another robin, with its token red chest.
Brian said: "The white robin was a bit skittish, because it was very easy to see. It stuck out like a sore thumb.
"They're really rare - you usually only see one every couple of years around the UK.
"And even then, they're not usually as white as this one - usually they have a little bit of grey or brown in them.
"This one is almost entirely white, apart from its eyes - even its beak is almost white."
Brian added that the two robins were seen hopping around gathering food first thing in the morning last Thursday.
And he said: "Albino robins, or part-albino robins like this one, tend to struggle to find a mate, and they often don't last as long because they get picked on by the other birds.
"But people who live on a housing estate near the cycle path say that this one has been around since at least October - so it's doing alright for itself.
"And it seemed to be making a nest - so hopefully it has found itself a mate, maybe the other robin that it was with."