1.   Hunger and the bitter cold would have reduced bird numbers and driven species to flock in the open fields.

2.   This trade may be driving some species to extinction.

3.   Ducks from Britain are being blamed for driving a species in Europe to the verge of extinction.

4.   Despite the uncertainty, few biologists who grapple with the question doubt that humanity is driving other species toward extinction at an accelerating pace.

5.   Genetically improved fish might drive native species to extinction.

6.   Hunting, poisoning and loss of habitat drove the species to the edge of oblivion.

7.   The virus was to have been destroyed this month, the first species driven to extinction by design rather than accident.

8.   Today, habitat degradation and poaching conspire to drive the species to the edge of extinction.