Honeybees have outstanding sniffing ability.
Their antennae are covered with thousands of microscopic sensors. As a result, minute amounts of only parts per billion of
molecules can be detected. Besides locating pollen, the bees also can be trained to search out explosives, drugs, or
chemical contaminants. They are taught to seek out and hover over particular chemicals which they associate with a sugary
treat, using a process called Pavlovian conditioning. The insects learn faster than search dogs, and they pick up weak scents
that the canines miss.
Gaidos, Susan. 2008."Sting Operation" Science
News 174(7): 16-19.
Rains, Glen, Jeffery
Tomberlin, and Don Kulasiri. 2008. "Using insect sniffing devices for detection" Trends in Biotechnology