OUTER: foreach my $animal ($twoDimArray[0]) {

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You have to dereference the array in $twoDimArray[0]: 

OUTER: foreach my $animal (@{$twoDimArray[0]}) {

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In reply to Re: 2d arrays and 'Can't use string as an ARRAY ref' by jwkrahn
in thread 2d arrays and 'Can't use string as an ARRAY ref' by ronlewis

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