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  <h2>Humming Birds</h2>
  <img src=https://bit.ly/2boyXx8 alt="humming bird" />
  <p>
      The Hummingbirds are New World birds that constitute the family Trochilidae. They are among the smallest of birds, most species measuring in the 7.5–13 cm (3–5 in) range.
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  <p>
    Indeed, the smallest extant bird species is a hummingbird, the 5-cm bee hummingbird, weighing less than a U.S. penny (2.5 g).
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  <p>
    They are known as hummingbirds because of the humming sound created by their beating wings which flap at high frequencies audible to humans.
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  <p>
    They hover in mid-air at rapid wing-flapping rates, typically around 50 times per second, allowing them also to fly at speeds exceeding 15 m/s (54 km/h; 34 mph), backwards.
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  <p>
    Hummingbirds have the highest metabolism of any homeothermic animal.
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  <p>
     To conserve energy when food is scarce, and nightly when not foraging, they go into torpor, a state similar to hibernation, slowing metabolic rate to 1/15th of its normal rate.
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