Crows are social birds that congregate in huge flocks. While the flock grazes in a field, lookouts will be posted to watch for approaching danger. They'll raise the alarm if humans approach.
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More Daily Trivia
Elephant tusks grow throughout an elephant's life and can weigh more than 200 pounds. Among Asian elephants, only the males have tusks. Both sexes of African elephants have tusks.
A device invented as a primitive steam engine by the Greek engineer Hero, about the time of the birth of Christ, is used today as a rotating lawn sprinkler.
In 1986, a guard in an armored car was killed when $50,000 worth of quarters fell on him.
In Alaska, it is legal to shoot bears. However, waking a sleeping bear for the purpose of taking a photograph is prohibited.
Most dangerous of all avalanches, snow avalanches occur about a million times a year.
In one year, the average human heart circulates from 770,000 to 1.6 million gallons of blood through the body. This is enough fluid to fill 200 tank cars, each with a capacity of 8,000 gallons.