1.   The main threats to the plants appear to be casual picking by admiring walkers and being dug up by serious collectors.

2.   The birds live on three small Indonesian islands and until recently the main threat to their survival came from loss of habitat.

3.   The main threat was from ground fire.

4.   The main threat to the southern raider looks like being Irish import Black Parachute.

5.   The main threats to the group are political, including the risks of a trade war, selective US taxes on foreign companies, and VAT on UK food.

6.   An isolated storm or two will approach severe levels, with damaging straight-line winds posing the main threat for severe weather.

7.   Baffert conceded that his old California rival, Free House, would be his main threat again Saturday.

8.   A slowdown would reduce the risks of an increase in inflation, which many analysts think is the main threat to sustained economic health.

9.   Advocates of the system blame commercialization, technological innovation, spamming and the lack of government supervision as the main threats to this virtual soap box.

10.   Continental Airlines Inc. closed its Denver hub last year, leaving United as the main threat.