This was a field-based experiment to attempt to answer a question: Do birds have a favourite colour? Four coloured feeders (dark blue, green, red and yellow) and a clear control were used. The number of visits and the mass change in the feeders were recorded so preferences could be determined. The results show a clear trend for blue being the preferred colour; red and yellow were unpopular. We suggest that this is because high-energy colours (blue and

UV) are used by birds in short-distance communication; blue is also in the middle of the birds’ visual spectrum. We also suggest that yellow and red were unpopular because they are employed for aposematic colouration (toxin colours) in nature. Applications of this research could include influencing the design of turbines or aeroplanes, to deter birds.