Migratory birds are known to use the
geomagnetic field as a source of compass information.
Scientists have shown that oscillating magnetic fields
disrupt the orientation behavior of migratory birds.
Researchers found that robins were disoriented when
exposed to a vertically aligned, broadband or a
single-frequency field.
According to Alasdair Philips of Powerwatch,
"... medium- and short-wave frequencies have been
used since the 1930s with little evidence of any effect
on bird behavior. But since the mobile phone networks
went up there have been increasing reports of birds,
especially homing pigeons, getting lost. Research now
needs to look at the effects of base station signals,
particularly in view of the disorientating effects of
EMR 'noise' reported in this study."