Amazing Facts About Sharks


 

You might not know  these   sleek,  swift  swimmers as  well  as  you think.

Dive into these surprising facts:

Sharks  are one  of  the  oldest   animals   on   Earth. They evolved over  400  million  years  ago,   before the first dinosaurs. They have changed very little in that time.

There are more than 370 species   of   sharks,   and about  half  of them are less than 3 feet long  when fully grown.

Sharks   have    a   keen   sense  of  smell.  Scientists estimate that scent detection makes  up  about  70 percent of a shark's total brain activity!

Some   sharks,   such  as  the  reef  and  bull  shark,  have     color   vision  that  attracts  them    to  bright orange  and  yellow  shades.    Shark-savvy    scuba divers avoid  these  colors,   calling  them "yum-yum yellow."

The   inside  of   a  shark's  jaw  has  many  rows  of teeth.   These  rows  usually  lie   flat   until   the  first tooth  in  front  falls  out.   It   is  then   replaced   by another tooth popping forward   to  replace it,  as  if on   a   conveyor    belt.     This    process   of     teeth replacement continues throughout a shark's life, so it has a lifetime supply of chompers!

Sharks   do    not   chew  their  food.   Instead,  they swallow their bites whole.A big meal, such as a sea lion or turtle, may fill up a shark for  over  a  month.

Cartilage, the tough,   flexible  material  that  makes up   a   shark's   skeleton,  is  used  both  for  cancer research and as   a   possible  skin  replacement  for burn victims.

Experts say that only half a dozen types of sharksare very dangerous.  Most  are  shy  and   harmless, avoiding   people    and  other  large   animals  when possible.

People  kill  over  a hundred million sharks per year. Shark    skins   are  used  to  create  strong   leather. Some sharks are eaten for their  meat  or  in  shark fin soup, while others are used for fertilizer.

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