Virus is a microscopic organism that lives in a cell of another living thing. Although viruses are extremely small and simple, they are a major cause of disease. Some viruses infect human beings with such diseases as measles, influenza, and the common cold.
Passive Mobs. Passive mobs are composed of creatures that will never, under any circumstances, attack the player. Some passive mobs can be bred to create more of them, e.g. pigs can be bred to effectively farm them.
Boa Constrictors can be bred in captivity by following a number of simple but essential steps. Putting together your breeding group is the first step. Sexual maturity in boas is typically reached at 18 months for males and 30 months for females. Similar to other snakes it is good practice to start males breeding in their third winter and females in their forth.