How to test a bee's sense of smell

Scientists in Southampton have discovered that honeybees' ability to find flowers could be hampered by a chemical in diesel exhaust. The researchers used a sort of bee "sniff test", known as the proboscis extension reflex test, to see how sensitive the bees were to floral scents. via Pocket http://www.bbc.co.uk/news/24374310#sa-ns_mchannel=rss&ns_source=PublicRSS20-sa