"Scientists have long wondered how migrating birds find their way, frequently at night, across vast geographical spaces to their ultimate destinations. The mystery is deepened by the uncanny accuracy with which many species are able to relocate specific breeding or wintering sites, year after year. Ornithologists know from more than 50 years of study and experimentation that migrating birds rely on various senses and behaviors to guide them. It appears that no single process or mechanism can account for all of the behaviors we see. Rather, the migratory guidance system of birds is built from a complex array of subsystems."D. A. Sibley, C. Elphick, J. B. Dunning Jr.: The Sibley Guide to Bird Life & Behavior
Alfred A. Knopf Publisher, New York - 2002
pag. 63
catalogazione: libreria in camera da letto
