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Illegal loggers usually carry guns, says Yevgeni, have sophisticated saws that cannot be heard beyond a dozen metres and place watchmen with satellite phones to warn of intruders.

To make matters worse, standard tests that should warn of trouble sometimes fail to detect blood vessel obstruction when they're used in women.

But development experts say the way ahead may not be easy and warn of more standoffs between business and farmers as the country's economic priorities shift from agriculture to industry.

Birds sometimes chatter to each other to warn of danger.

But some warn of a growing digital divide in the markets.

There are few greens in Turkey to warn of the environmental consequences of pursuing growth at any cost.

He was also one of the first scientists to suggest that chemicals could imitate hormones and to warn of the dangers of this chemical deception.

Current guidelines on using aspirin for reducing the chances of a stroke or heart attack rightly warn of the small risk of ulcers and of dangerous bleeding in the stomach.

Doctors warn of the risks to Japan's cherished health system.

Amid Beijing's apparent enthusiasm for Glorious Mission, some observers warn of conflating real warfare with mere simulations.

In the fall Jean put a yellow collar around Frankie's neck to warn off hunters.

Sensors in your car tuned to radio signals from orbiting satellites can locate your car precisely at any moment and warn of traffic jams.

But collectively, they should be able to warn of dangers ahead.