Bees, landmines, pizzas, guitars
According to the Financial Times, the US army is using bees equipped with data-sending microchips ("smart tags") to detect landmines:
Bees have a liking for the explosive TNT. When tagged bees are released close to areas where landmines have been planted, some of them will home in on the mines. Bees returning to the hive land on special mats that can detect TNT and identify individual bees. The direction of a bee's flight and its flight time are used to calculate the approximate position of any landmines.