A blue whale's heart can weigh over 400 pounds.
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In 1809, two countries declared war and then forgot to sign a peace treaty for years.
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Ankylosaurus had a heavily armored body and a clubbed tail.
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The brain named itself.
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The human liver can regenerate lost tissue.
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A rhinoceros has thick skin for protection.
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Rats can learn complex maze patterns quickly.
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Grizzly bears can run at speeds over 30 miles per hour.
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Some fish can survive in near-freezing water.
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