Unusually amorous Yang Yang and Long Hui try for their FOURTH baby

Pandas are not typically known for their lovemaking prowess in zoos, but one pair seem to have no problems at all getting some action. Two amorous Giant Pandas have caused a 'sensation' by being the only pandas in Europe to mate in captivity, and have already produced three babies since they arrived at the zoo in 2003. Yang Yang and Long Hui were seen romping on several occasions recently at Schonbrunn Zoo in Vienna.

Rare footage shows the pair mating energetically - before the female loses patience and cuffs the male about the head. The Giant Pandas are normally loners but more recently they have been restless, not eating too much, leaving their mark everywhere and making a lot of noise. Zookeepers noticed their behaviour change around a week ago and let the two bears get together.