An average cat has 1-8 kittens per litter and can have 2-3 litters per year. During her productive life, one female cat could have more than 100 kittens. A single pair of cats and their kittens can produce as many as 420,000 kittens in just 7 years.
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Cats sleep for 70% of their lives.
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Denmark has twice as many pigs as there are people.
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Sergeant Stubby was the only war dog to be promoted to sergeant through combat in WWI. He saved his regiment from surprise mustard gas attacks, found and comforted the wounded, and even once caught a German spy by the seat of his pants, holding him there until American Soldiers found him.
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A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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An alligator can go through 2,000 to 3,000 teeth in a lifetime.
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