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."