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問２
Living in the city and living in the country require different skills. This is true for humans, of course, but also for birds. In one study, scientists took 53 birds from urban and rural areas of Barbados, one of the Caribbean islands, conducted a variety of tests, released them back into their natural surroundings, and reported their findings. ①The birds from urban areas were better at problem-solving tasks than the ones from rural environments. ②The researchers prepared several experiments to check the differences between the groups of birds. ③The urban birds had more capacity to resist disease than the rural ones. ④The researchers had expected that in comparison to the rural birds, the urbn birds would be smarter but weaker. Being both smart and strong was thought to be unlikely. However, it seems that urban birds have it all.