Tactical UAVs for reconnaissance and surveillance are pretty small. The Pointer and Dragon UAV have wingspans of 9' an 11' respectively.
There was a "concept" paper a few years back about T-UAVs about the size of a cigarette pack.
Photo cracks me up. Really how proud they are... maybe this is a psyops setup to make them look like total fools.
If you like this stuff, also Google "swarming warfare"... the idea / science of sending tiny little things that act like a swarm of bees against your adversary. Also research SAGEM Sperwer to see one of the latest, powerful UAV implementations.