Nano UAVs

* The notion of bird-sized or even insect-sized MAVs hasn't disappeared. In late 2005, DARPA opened up a competition for "nano-UAVs", specified to weigh no more than 10 grams, including a 2 gram payload, and with dimensions no greater than 5 centimeters (2 inches) in any direction. Range was a maximum of a kilometer, with the machine to be able to hover for a minute or so at maximum range. The goal was to build a vehicle that could be used to check on adversary forces in buildings and tunnels.

source: http://www.vectorsite.net/twuav_17.html