Lobsters are invertebrates, members of the Class Crustacea of the Phylum Arthropoda. This class includes animals without backbones and with hard shells like crab, shrimp, crayfish, water fleas and wood lice. A male lobster is called a cock and a female a hen or chicken (when she weighs about 1 pound).
The Big Book serves as the basis of Alcoholics Anonymous (AA). It contains the 12 steps that are at the core of the Alcoholics Anonymous program, as well as stories about alcoholics who have been through the recovery process.
In the introduction to the Big Book, William Duncan Silkworth, M.D., a specialist in the treatment of alcoholism, endorses the AA program after treating Bill W, the founder of AA, and other apparently hopeless alcoholics who then regained their health by joining the AA fellowship.