To begin to explore the hidden world of ultraviolet.
I'm meeting Ron Douglas, professor of visual neuroscience at London City University, and some very friendly birds.
We've got starlings here who are eagerly taking away the food we've got for them.
Starlings have a special relationship with UV.
Their eyes can see this color and some of the female birds' feathers reflect it.
I'm intrigued to know why.
They are actually very, very sensitive to UV.
They have photoreceptors that respond the UV, and they also have lenses at the front of the eyes and let the UV through.
So they really are true experts in UV vision.
And what is it that they're looking at? What can they see with UV vision?
