Love in the air for pandas?

Female panda Tian Tian (pictured) will meet Yang Guang for a second time Credit: Reuters

Zookeepers will be hoping love is in the air as the UK's only pandas come face-to-face for a second time as part of a programme to encourage them to mate.

The bears were introduced on Tuesday and, despite being brought together five times throughout the day, failed to mate. There were "very positive" signs however, the zoo said.

The pair have a window of just 36 hours in which to mate, after tests showed she had ovulated.

Male panda Yang Guang (pictured) and Tian Tian have a window of 36 hours in which to mate Credit: Reuters