Most owls live in trees but the burrowing owl lives in holes and tunnels in the ground that it digs with its feet.
Green mops
Green mops Scientists in France are studying the genetic
properties that allow lichens to tolerate high levels of heavy
metals. Scientists hope that understanding this genetic mechanism
will enable them to genetically engineer plants which can clean up
heavy metal pollution. 21 NOVEMBER 1998, P. 27
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