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Islands make good prisons. That’s why the only one of dozens featured in
the Natural History of the Islands of California that most will have heard of is
Alcatraz. But islands are also good prisons for wildlife, keeping natives apart
from alien species and humans alike. Much of the California that has disappeared
beneath freeways lives on there. By Allan A. Schoenherr and others, published by
University of California Press,$45, ISBN 0520211979.