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The Ruby Throated Hummingbird has a resting heart rate of 250 beats per minute. When it is threatened or chased, it's heart rate can reach 1200 beats per minute. Predict its lifespan and justify your explanation.

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    There are many animal species that seem to have an average life span of about 1 billion heartbeats. Birds and humans included.

    See
    http://www.beholders.org/mind/scienceandfacts/124-1billionheartbeats.html

    for more about that.

    Hummingbirds don't spend a lot of time resting. I'd expect an average heart rate of 500 b.p.m. At that rate, one billion beats would take 4 years.

    That happens to be the observed average life of that bird species. Some have lived 12 years.

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