If you are looking for a new car then you might want to avoid a red one, particularly if you find cleaning it tedious. It seems red cars are more likely to be hit by bird poo than any other colour. It is not clear why they have a preference for red but it has been suggested that it signifies danger. Research carried out in five cities found that 18% of red cars were marked with bird poo, followed by 14% of blue cars, 11% of black cars and 7% of white cars. Green cars were the birds least favourite with only 1% being marked by bird poo.