* Rats multiply so quickly that in 18 months, two rats could have over 1 million descendents. *
* The oldest multicellular fossils date from ~700 million years ago. *
* Ants do not sleep. *
* The embryos of tiger sharks fight each other while in their mother's womb, the survivor being the baby shark that is born. *
* Elephants have been known to remain standing after they die. *
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