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When she appears to Karsh to deliver some bad news as a koala bear, he politely asks her to stop playing around.

Even a few decades ago, spotting a koala snuggled in a backyard tree was nothing out of the ordinary.

Blink, and a friend’s little bundle of semi-consciousness has grown to the size of a koala.

Like other organisms, some yeasts have evolved to be specialists -- think koalas, which eat nothing but eucalyptus leaves -- while others are generalists like raccoons, which eat just about anything.

More than a dozen koalas were convalescing in open-air enclosures, wrapping their woolly arms around the trunks of eucalyptus trees.