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The study by Tokyo University of Agriculture found cats spent significantly longer sniffing tubes containing the odours of unknown people compared to tubes containing their owner's smell.

A 16-year-old student told local media that the shredded chicken in the meal had an "unpleasant odour".

For their investigations, the researchers combined physiological studies - such as imaging techniques to visualise processes in the fly brain, chemical analyses of environmental odours, and behavioural studies.

Researchers who examined nine mummies found that though there was some difference in the intensity of their odours, all could be described as "woody", "spicy" and "sweet".

Staff at the terminus in the city centre said the odour had been lingering inside the building for at least 10 days.