The history behind the cock and the swine tattoo dates back to the days of clippers ships and when sailing the seas was very treacherous. When a sailor has the tattoos they would be primarily placed on the feet of his/her body. What this meant was that the man/woman would not drown if ship wrecked or was scuttled. Now what is behind the symbolism. When a ship would be shipwrecked or lost at sea most of the time all that would be left would be provisioned floating in the ocean. Almost certainly after a shipwreck the swines and cocks would be found floating among the wreckage. This is because they would be corralled in a wooden crate, and thus be found floating and meandering through the ocean. This also leads back to why sailors would get it tattooed on their feet.