Jellyfish as a species are actually older than dinosaurs and sharks.
383
Cows can sleep standing up, but they can only dream lying down.
745
Cats and dogs can hear ultrasound.
350
It has been calculated that a single breath from a mature blue whale can inflate up to 2,000 balloons.
492
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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