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Last Updated: Tuesday January 11 2011 15:39 GMT

Cross-eyed opossum is a web hit!

Heidi the cross-eyed opossum

Meet Heidi, the cross-eyed opossum

An abandoned cross-eyed opossum called Heidi has become a big star in Germany.

Heidi moved to Leipzig Zoo in May after being found outside an animal shelter in America with her sister Naira.

She won't be on display until July, but her photos have been such a hit online she's already had a song written about her and a toy made to look like her.

Animal experts say Heidi may be cross-eyed as a result of a poor diet before she was abandoned, and excess fat deposits behind her eyes.

She can still get about though, as opossums are nocturnal, and find their way around using their noses.

Heidi, who is thought to be about two and a half years old, is the latest animal to find fame in Germany, after Paul the Octopus gained worldwide attention for predicting the 2010 World Cup results.

She's has also inspired a song to be written about her, including the lyrics: "Heidi is so sweet. How nice that she exists. I fell so in love with her from the first."