Mated females also had a chance to listen to two different performance songs, one from an unknown male, and one from their mate. They spent more time listening, to the concert version of their mates songs. This suggests that after a while, females learn to recognize--and preferthe songs of their mates.

　　Scientists then studied the brains of the females. They found certain areas of the brain perked up when the birds listened to the concert songs. These brain areas may be involved in recognizing and evaluating the songs, and storing the memories of them.

　　This research deals with whats called directed communication, when the communicator, or sender, focuses the message for a specific audience. One example is the way moms speak to their babies. Mothers around the world use the same sort of high-pitched sing-song chatter, and the babies respond best to those sounds. Songbirds are one of the only other species known to learn their communication, in this case their songs.

　　36. What does the first paragraph say about zebra finches?

　　A Male zebra finches like to sing to female zebra finches.

　　B Male zebra finches sing louder than female zebra finches.

　　C Male zebra finches change their songs in female zebra finches presence.

　　D Male zebra finches like to listen to female zebra finches sing.

　　37. What did the researchers find in their study of female zebra finches?

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