Tadpoles

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After about 21 days as spawn, the embryonic frog leaves its protective jelly as a tadpole, complete with organs, gills and a long tail.
  

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There is one kind of frog that is native to the UK, the common frog, which is found in most parts of the UK. The other was the pool frog which is believed to have become extinct in the 1990s and has since been reintroduced to a site in East Anglia

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