Martha was born in a zoo. He never flew in the sky in his life, and died with only one bird in the zoo.

Martha will never know why she was named "passenger pigeon. She would never have known that her ancestors once lived in flocks so large that they covered the sky.

Martha can't imagine what it must have been like for her ancestors to live in a zoo, in a swarm that could cover the sky.

He was raised by humans. Even in the face of the humans who overhunted and exterminated his family ancestors He felt no bitterness or sadness because he did not know that Passenger pigeons, which once outnumbered the earth's population, migrated in flocks of hundreds of millions.

The sky was filled with so many of them that it took days of darkness for the flock to pass.

But humans overhunted them and they became extinct.

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