A leaked report shows that the US had 144 drones in Iraq, mostly Ravens. I think that this is likely only a partial list, because it would be surprising if there weren’t any Predators, or other drones. Also, the UK has drones and perhaps other countries as well. I think that the Iraqi government has also acquired drones.
Ravens are very small surveillance drones, weighing a little more than two kilograms. It seems unlikely that there are only 144 deployed in Iraq. Here’s a YouTube video of a Raven drone.