How much do you know about birds?
Can you answer the question asked?
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ANSWER: a. Blue Tits
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Although blue tits are small, they are highly intelligent - they can adapt easily and solve complex problems. In some U.K. towns, they followed the milk trucks and punctured the foil lids, sipping small drinks of milk. The amount wasn’t much, but due to contamination the milk was unusable. With modern milk distribution, this problem has pretty much evaporated. (play.howstuffworks.com)