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The UK's rarest frog is the pool frog and they can be found in ponds at a secret location in Norfolk. Although the last native English pool frogs died out over a decade ago, they were reintroduced here from Sweden in 2005-2008. Joanna Pinnock meets John Baker, a consultant specialising in reptiles and amphibians, who is monitoring their numbers. Joanna also comes face to face with a couple of grass snakes on site and encounters their very smelly defence strategy! Producer Brett Westwood