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Normally the courgettes are pretty safe but last year mine were all eaten too. Not sure if it was slugs, squirrels, wood pigeons, foxes or badgers so I firs put them under a cloche, then netted them and used beer traps, slug pellets and eggshells just in case. Worked OK so far. Possible problem could also be putting them out when they are still relatively tender and small.
something's eaten all my courgette seedlings =( nothing else though.. I had no idea they were so tasty ...