Have you ever wondered what the world looks like to birds?
It turns out that unlike the human eye, birds can detect a fourth primary colour.
Humans are sensitive to red, blue and green frequencies in light, but birds can detect a fourth - ultraviolet.
The discovery comes from Lund University professor Dan-Eric Nilsson and also Cynthia Tedore who collaborated with Nilsson while at Lund.
The Lund Vision Group have even designed a special camera that recreates how birds see colours in their surroundings, and it's something you can experience in the video above.