The term given to the cosmological and ritual records and practices of the Etruscans (Haruspicini, Fulgurales, Rituales, etc.) as recorded by Cicero. This tradition has a mythical founder in the form of Tages. In Roman tradition, the practice involved the observation and interpretation of signs (auspices) of divine origin, which took the form of celestial and metereological phenomena, the flight of birds, and the entrails of animals.
Historical Dictionary of the Etruscans. Simon K. F. Stoddart.