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Edinburgh Zoo's giant pandas have failed to mate this year despite the best efforts of the Scottish zoo to encourage them to procreate, dashing hopes that a baby panda would be born this year.

Sweetie and her male mate Sunshine arrived in Scotland from China last December and had been kept in separate enclosures until this week, when experts decided the time to mate had arrived.

Female pandas ovulate once a year, with only a 36-hour period in which they can get conceive.

Despite showing an interest in each other, the duo failed to take advantage of their short 'window of opportunity.'

Now Sunshine will have to wait another year to take his chance. What will zoo officials do to encourage them to mate next year?