Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: Footage of an adorable koala joey under the care of two zookeepers has been released in celebration of her first birthday. Imogen has grown bigger but stayed as cute as ever under the care of Kylie Elliot and Matt Radnidge from Symbio Wildlife Park in Helensburgh, south of Sydney. Video taken during Imogen's first photo shoot at 10 months of age, was released in preparation for her first birthday festivities. Scroll down for video In the clip the joey sits in a baby basket cuddling and latching on to the soft koala toy with her tiny claws. Curious little Imogen is also seen observing her surroundings and eating eucalyptus leaves.New video has been released of Koala joey Imogen in a baby basket in celebration of her first birthdayThe joey was hand-reared by zookeepers after her mother died at Symbio Wildlife Park, south of SydneyKylie Elliot and Matt Radnidge have been taking care of her and another orphan koala joey, Harry, for almost a yearThey have been posting videos and updates online sharing Imogen's journey 
 Question:_ and Harry were born at the Helensburgh park, south of Sydney, earlier this year, but Harry's mother died of leukaemia when he was just 22 weeks old and he did not receive the vital pap - partly digested eucalyptus leaves excreted by mother koalas - he needed to survive.

Imogen