I was just reading this page: http://www.religioromana.net/ritualmoments.htm and saw this segment:
Birds are regarded as spirits of our ancestors and messengers from the gods. Feeding wild birds in the morning is an extension of the lararium rite. Wild seed can be blessed to the purpose by holding the right hand, palm down, over the seed and saying, Ab illo benedicaris, in quorum honore edeberis. May you be blessed by those in whose honor you shall be eaten. Then the birds are called, Venite aves. Ponete alas in spirito et venite! Come birds. Put wing on the wind and come!
Is there any more information on Romans and their dealings with birds? My self-professed Roman grandfather was really into keeping pigeons until the Depression when the family had to resort to desperate measures . He was also into birding and everything. It passed down to my mom, who earned the nicknamed the "bird lady," and then onto me. As a result, I own seven parakeets and have two swallows tattooed on my chest. Even my son loves watching birds whether they are in a pet store, at the zoo or at a lake. It's something that's always been a part of my life.
N.B. I'm not sure if augury fits in this subforum as it may be more applicable to religion so I'm just leaving it open-ended about birds.
Di vos incolumes custodiant!