My strange pets

 Hello everyone. Today, I'd like to introduce my pets. I have five zebra finches. Zebra finch lives in Australia. They are small and look cute. The males learn singing from their father.

 Their learning ability is so developed that many scientists have them in their lab to research their brains. I heard that the bird has great learning ability but I can't believe the fact. It is because I feel that their sing which they learned from their father isn't similar to father's song. In addition, their sing sounds strange. When I hear the song, I can't concentrate on anything.

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