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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A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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Domestic pigs average a top speed of about 11 miles per hour.
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Cats and dogs can hear ultrasound.
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Dolphins can rapidly heal from extreme injuries, such as shark bites, and regenerate their original body shape.
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Squirrels will sometimes adopt orphaned baby squirrels that they’re related to.
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