While lobsters and crabs are certainly animals in the biological sense, the letter points out that "in the UK, decapods fall outside of the legal definition of 'animal' in the Animal Welfare Act 2006, and so there is currently no legal requirement for food processors, supermarkets or restaurants to consider their welfare during storage, handling or killing."
It is necessary to either cook or freeze lobsters and crabs quickly after they are killed, because the meat spoils rapidly...."
http://www.bbc.com/news/science-environment-42873644
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