By Antoinette Radford BBC News Edited by Amal Udawatta IMAGE SOURCE, TANYA LATTY While some start the festive season to the tunes of Mariah Carey, for many Australians, there is another way of knowing Christmas is on the way. The arrival of the clumsy Christmas beetle - a brightly coloured insect that sneaks into bed sheets, crashes into windows and swarms around streetlights in summer months. "We have in Australia this really unique... biological event where Christmas is associated with the arrival of these beautiful, glittery, friendly beetles," Associate Professor at the University of Sydney, Dr Tanya Latty, tells the BBC. The beetles - which don't bite or sting and are harmless - used to be a very common sight. In 1932, they were so prolific Queenslanders could be paid one pound to catch 200. But now, scientists dream of seeing as many in one place. Most species of the beetle are unique to Australia - like the platypus and koala - but for many in the country, they hav