Invisible Bugs Magic Picture Book (Dover Little Activity Books)
Rub the blank space on each page of this book with the tip of a pencil and find out which bugs bore through woods; which large, hairy spider living in warm climates can survive more than 25 years; and what long, slender bug looks like a tree twig. Answers to these and 13 other nature-related puzzles are revealed by the pencil rubbings.
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