There are over 8,500 different species of birds on the Earth.
Deadly legacy
Deadly legacy Evidence that a spill of toxic waste into the
Guadalquivir river in Spain is having an effect on local wildlife
has been found in the area's bird populations. Blood samples from
birds along the river show that they have potentially lethal
amounts of heavy metals in their bodies. 24 OCTOBER 1998, P. 24
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