Marys / Marries is a beasts pirates scouting unit. Consists of animals such as cats, rats, frogs whose faces are affixed with a paper with an eye symbol on their face. Everything Mary sees can be seen by the human side. For example, Bao Huang can see what the cat Marys sees. Read in Chapters 993
In wano wars, Marys were used to locate the Ninja-Pirate-Mink-Samurai Alliance