Assertion: auspice | /r/HasProperty | announced by any kind of bird
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text: this seems useful (sorry for no italics and such): Servius's commentary on Virgil's Aeneid I.398: "The difference between an augury and an auspice is that the augury is both requested and announced by quite specific birds, whereas the auspice can be announced by any kind of bird and is not requested" That came from Foundation, Dedication and Consecration in Early Modern Europe edited by M. Delbeke, M. Schraven which I found in Google books.