-ornithomancy-

n. [ Gr. &unr_;; 'o`rnis, 'o`rniqos, a bird + &unr_; divination: cf. F. ornithomancie. ] Divination by means of birds, their flight, etc. [ 1913 Webster ]

Ornithomancy grew into an elaborate science. De Quincey. [ 1913 Webster ]