The Library of Birmingham has received 100,000 visitors since it opened last week.
The building, which cost £189 million to build, is the biggest library in Europe.
Bosses originally predicted that 10,000 people would visit each day.
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The RSPCA are urgently encouraging potential fosters to get in touch.
The library book was borrowed eight years ago and has just been handed in to a library in Kentucky.
She now has one pellet by her brain and one pellet by her heart.