By Simon Rocker, February 18, 2010
If you can't tell the difference between a mallard and a muscovy, you could be in trouble.
A poultry abattoir in New York's strictly Orthodox enclave of Kiryas Joel was recently ordered by rabbis to recall a consignment of doubtful ducks.
Now, the Torah specifies only what birds you cannot eat and duck is not among them. Later rabbis, however, instituted a rule permitting only birds where there existed an established local tradition of consumption.