The effect of magnetic field-free space on the acoustic behavior of budgerigars (Melopsittacus undulafus)

The effect of magnetic field-free space (MFFS) on the acoustic behavior of budgerigar (Melopsittacus undulafus) is obvious. The daily frequency of their cries in uniform MFFS (UMFFS) and non-uniform MFFS (NMFFS) decreases by 44.7±10.0% as compared with that in the geomagnetic field (GMF) on the average. The occupation rate of protesting cries (R ^sub op^) in NMFFS decreases by 8.5%-20.3% as compared with that in GMF on the average and shows an adaptability variation. In 75% of the observation days, the R ^sub op^ in UMFFS increases by 16.2%-23.3% as compared with that in GMF. As for the effect of MFFS on the rhythmic habits of budgerigars, only the ending time of crying is affected to certain extent, 67 minutes earlier than in GMF on the average.[PUBLICATION ABSTRACT]