Scientists at a U.S. weapons laboratory say they have trained bees to sniff out explosives in a project they say could have far-reaching applications for U.S. homeland security and the Iraq war.

Researchers at the Los Alamos National Laboratory in New Mexico said they trained honeybees to stick out their proboscis -- the tube they use to feed on nectar -- when they smell explosives in anything from cars and roadside bombs to belts similar to those used by suicide bombers.

Researchers in the program, dubbed the Stealthy Insect Sensor Project, published their findings Monday.

By exposing the insects to the odor of explosives followed by a sugar water reward, researchers said they trained bees to recognize substances ranging from dynamite and C-4 plastic explosives to the Howitzer propellant grains used in improvised explosive devices in Iraq.

"When bees detect the presence of explosives, they simply stick their proboscis out," research scientist Tim Haarmann told Reuters in a telephone interview. "You don't have to be an expert in animal behavior to understand it as there is no ambiguity."...