What you see below are screenshots of an interactive map set up by Slate’s Chris Kirk, which compare drone strikes from Bush (red) and Obama (blue). Lighter colors around a circle means some non-militants — aka civilians — were killed in that strike. Here’s one of Obama’s attacks:
And here’s one of Bush’s attacks:
Don’t forget to check out the interactive map. Once you’re there, click on a circle to see details about the strike, including the administration responsible, the date, the location, and the number of militants and non-militants killed.